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10th Edition

Jerome E. Kaufmann + 1 other

Publisher: Cengage Learning

ISBN: 9781285195728

Chapter 10.CR, Problem 38CR

Textbook Problem

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For problems 27-42, solve each problem by setting up and solving a system of two equations and two unknowns or a system of three equations and three unknowns.

**38.** In an ideal textbook, every problem set has a fixed number of review problems and a fixed number of problems on the new material. Professor Kelly always assigned 80% of the review problems and 40% of the problems on the new material, which amounted to 56 problems. Professor Edward always assigned 100% of the review problems and 60% of the problems on the new material, which amounted to 78 problems. How many problems of each type are in the problem sets?

To determine

**To find:**

The number of problems of each type in the problem sets, by setting up and solving a system of two equations and two unknowns or a system of three equations and three unknowns

**Given:**

In an ideal textbook, every problem set has a fixed number of review problems and a fixed number of problems on the new material. Professor Kelly always assigned 80% of the review problems and 40% of the problems on the new material, which amounted to 56 problems. Professor Edward always assigned 100% of the review problems and 60% of the problems on the new material, which amounted to 78 problems.

**Approach:**

Elimination-by-addition method:

The process of elimination-by-addition method leads to the elimination of one variable, so that the resulting equation can be solved for the remaining variable.

If

**Calculation:**

Let *x* be the number of review problems and *y* be the number problems on the new material.

Given that, Professor Kelly always assigned 80% of the review problems and 40% of the problems on the new material, which amounted to 56 problems.

Multiply throughout by 10 to clear out the decimals.

Divide throughout by 4.

Given that, Professor Edward always assigned 100% of the review problems and 60% of the problems on the new material, which amounted to 78 problems.

Multiply throughout by 10 to clear out the decimals.

Multiply throughout by 2.

Therefore the system of equations is

Intermediate Algebra

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Equivalent...Ch. 10.3 - For Problems 1-8, answer true or false. Any...Ch. 10.3 - For Problems 1-8, answer true or false. Any...Ch. 10.3 - For Problems 1-8, answer true or false. The...Ch. 10.3 - For Problems 1-8, answer true or false. The...Ch. 10.3 - For Problems 1-8, answer true or false. If an...Ch. 10.3 - For Problems 1-8, answer true or false. The system...Ch. 10.3 - For Problems 1-8, answer true or false. 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If the...Ch. 10.4 - Solve each of the following problems by setting up...Ch. 10.4 - Solve each of the following problems by setting up...Ch. 10.4 - Solve each of the following problems by setting up...Ch. 10.4 - Solve each of the following problems by setting up...Ch. 10.4 - Solve each of the following problems by setting up...Ch. 10.4 - Solve each of the following problems by setting up...Ch. 10.4 - Solve each of the following problems by setting up...Ch. 10.4 - Solve each of the following problems by setting up...Ch. 10.4 - Thoughts Into Words Give a step-by-step...Ch. 10.4 - Thoughts Into Words Describe how you would solve...Ch. 10.5 - For Problems 18, answer true or false. Graphing a...Ch. 10.5 - For Problems 18, answer true or false. Every...Ch. 10.5 - For Problems 18, answer true or false. Every...Ch. 10.5 - For Problems 18, answer true or false. Every...Ch. 10.5 - For Problems 18, answer true or false. Graphs of a...Ch. 10.5 - For Problems 18, answer true or false. The...Ch. 10.5 - For Problems 18, answer true or false. The...Ch. 10.5 - For Problems 18, answer true or false. The...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - For Problems 1-28, a graph each system so that...Ch. 10.5 - Thoughts Into Words What happens if you try to...Ch. 10.5 - Thoughts Into Words Explain how you would solve...Ch. 10.5 - Graphing Calculator Activities Use a graphing...Ch. 10.5 - Graphing Calculator Activities For each of the...Ch. 10.S - Sample Problem Solve (2x+y=4x+2y=1) by graphing.Ch. 10.S - Sample Problem Solve the system (y12x+2yx3)..Ch. 10.S - Sample Problem Solve the system (12x2y=07x+y=1).Ch. 10.S - Sample Problem Solve the system (2x5y=73x10y=13).Ch. 10.S - Sample Problem Solve (3x+12y=24x5y=17).Ch. 10.S - Sample Problem A car dealership has 510 cars and...Ch. 10.S - Sample Problem 7 Solve (x2y=22x+3y=11y4z=7)Ch. 10.S - Sample Problem A triangle has a perimeter of 55...Ch. 10.S - Sample Problem Solve (y=x2+1xy=1)Ch. 10.CR - For Problems 1-14, solve each system using the...Ch. 10.CR - For Problems 1-14, solve each system using the...Ch. 10.CR - For Problems 1-14, solve each system using the...Ch. 10.CR - For Problems 1-14, solve each system using the...Ch. 10.CR - For Problems 1-14, solve each system using the...Ch. 10.CR - For Problems 1-14, solve each system using the...Ch. 10.CR - For Problems 1 14, solve each system using the...Ch. 10.CR - For Problems 1-14, solve each system using the...Ch. 10.CR - For Problems 1 14, solve each system using the...Ch. 10.CR - For Problems 1-14, solve each system using the...Ch. 10.CR - For Problems 1 14, solve each system using the...Ch. 10.CR - For Problems 1 14, solve each system using the...Ch. 10.CR - For Problems 1 14, solve each system using the...Ch. 10.CR - For Problems 1 14, solve each system using the...Ch. 10.CR - For problems 15-20, solve each system....Ch. 10.CR - For problems 15-20, solve each system....Ch. 10.CR - For problems 15-20, solve each system....Ch. 10.CR - For problems 15-20, solve each system....Ch. 10.CR - For problems 15-20, solve each system....Ch. 10.CR - For problems 15-20, solve each system....Ch. 10.CR - For problems 21-22, graph the following system,...Ch. 10.CR - For problems 21-22, graph the following system,...Ch. 10.CR - For problems 23-26, indicate the solution set of...Ch. 10.CR - For problems 23-26, indicate the solution set of...Ch. 10.CR - For problems 23-26, indicate the solution set of...Ch. 10.CR - For problems 23-26, indicate the solution set of...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CR - For problems 27-42, solve each problem by setting...Ch. 10.CT - For Problems 1-4, refer to the following systems...Ch. 10.CT - 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For Problems 16-20, determine how many ordered...Ch. 10.CT - For Problems 16-20, determine how many ordered...Ch. 10.CT - Graph the solution set for the system: x+3y32x-y2Ch. 10.CT - For Problems 22-25, set up and solve a system of...Ch. 10.CT - For Problems 22-25, set up and solve a system of...Ch. 10.CT - For Problems 22-25, set up and solve a system of...Ch. 10.CT - For Problems 22-25, set up and solve a system of...Ch. 10.CM - For problems 1-5, evaluate each algebraic...Ch. 10.CM - For problems 1-5, evaluate each algebraic...Ch. 10.CM - For problems 1-5, evaluate each algebraic...Ch. 10.CM - For problems 1-5, evaluate each algebraic...Ch. 10.CM - For problems 1-5, evaluate each algebraic...Ch. 10.CM - For problems 6-15, perform the indicated...Ch. 10.CM - For problems 6-15, perform the indicated...Ch. 10.CM - For problems 6-15, perform the indicated...Ch. 10.CM - For problems 6-15, perform the indicated...Ch. 10.CM - For problems 6-15, perform the indicated...Ch. 10.CM - For problems 6-15, perform the indicated...Ch. 10.CM - 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For problems 26-33, evaluate each of the numerical...Ch. 10.CM - For problems 26-33, evaluate each of the numerical...Ch. 10.CM - For problems 26-33, evaluate each of the numerical...Ch. 10.CM - For problems 26-33, evaluate each of the numerical...Ch. 10.CM - For problems 26-33, evaluate each of the numerical...Ch. 10.CM - For problems 34-36, find the indicated products...Ch. 10.CM - For problems 34-36, find the indicated products...Ch. 10.CM - For problems 34-36, find the indicated products...Ch. 10.CM - For problems 37-44, express each radical...Ch. 10.CM - For problems 37-44, express each radical...Ch. 10.CM - For problems 37-44, express each radical...Ch. 10.CM - For problems 37-44, express each radical...Ch. 10.CM - For problems 37-44, express each radical...Ch. 10.CM - For problems 37-44, express each radical...Ch. 10.CM - For problems 37-44, express each radical...Ch. 10.CM - For problems 37-44, express each radical...Ch. 10.CM - For problems, 45-47, use the distributive property...Ch. 10.CM - For problems, 45-47, use the distributive property...Ch. 10.CM - For problems, 45-47, use the distributive property...Ch. 10.CM - For problems 48 and 49, rationalize the...Ch. 10.CM - For problems 48 and 49, rationalize the...Ch. 10.CM - For problems 50-52, use scientific notation to...Ch. 10.CM - For problems 50-52, use scientific notation to...Ch. 10.CM - For problems 50-52, use scientific notation to...Ch. 10.CM - For problems 53-56, find each of the indicated...Ch. 10.CM - For problems 53-56, find each of the indicated...Ch. 10.CM - For problems 53-56, find each of the indicated...Ch. 10.CM - For problems 53-56, find each of the indicated...Ch. 10.CM - Find the slope of the line determined by the...Ch. 10.CM - Find the slope of the line determined by the...Ch. 10.CM - Find the length of the line segment whose...Ch. 10.CM - Write the equation of the line that contains the...Ch. 10.CM - Write the equation of the line that is...Ch. 10.CM - Find the center and the length of a radius of the...Ch. 10.CM - For the parabola y=x2+10x+21, find the coordinates...Ch. 10.CM - For the ellipse x2+4y2=16, find the length of the...Ch. 10.CM - For problems 65-70, graph each of the equations....Ch. 10.CM - For problems 65-70, graph each of the equations....Ch. 10.CM - For problems 65-70, graph each of the equations....Ch. 10.CM - For problems 65-70, graph each of the equations....Ch. 10.CM - For problems 65-70, graph each of the equations....Ch. 10.CM - For problems 65-70, graph each of the equations....Ch. 10.CM - For problems 71-76, graph each of the functions....Ch. 10.CM - For problems 71-76, graph each of the functions....Ch. 10.CM - For problems 71-76, graph each of the functions....Ch. 10.CM - For problems 71-76, graph each of the functions....Ch. 10.CM - For problems 71-76, graph each of the functions....Ch. 10.CM - For problems 71-76, graph each of the functions....Ch. 10.CM - If f(x)=x3 and g(x)=2x2x1, find (gf)(x) and...Ch. 10.CM - Find the inverse (f1) of f(x)=3x7.Ch. 10.CM - Find the inverse of f(x)=12x+23.Ch. 10.CM - Find the constant of variation if y varies...Ch. 10.CM - If y is inversely proportional to the square of x,...Ch. 10.CM - The volume of a gas at a constant temperature...Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 83-103, solve each of the equations....Ch. 10.CM - For problems 104-113, solve each of the...Ch. 10.CM - For problems 104-113, solve each of the...Ch. 10.CM - For problems 104-113, solve each of the...Ch. 10.CM - For problems 104-113, solve each of the...Ch. 10.CM - For problems 104-113, solve each of the...Ch. 10.CM - For problems 104-113, solve each of the...Ch. 10.CM - For problems 104-113, solve each of the...Ch. 10.CM - For problems 114-118, solve each of the systems of...Ch. 10.CM - For problems 114-118, solve each of the systems of...Ch. 10.CM - For problems 114-118, solve each of the systems of...Ch. 10.CM - For problems 114-118, solve each of the systems of...Ch. 10.CM - For problems 114-118, solve each of the systems of...Ch. 10.CM - For problems 119-130, set up an equation, an...Ch. 10.CM - For problems 119-130, set up an equation, an...Ch. 10.CM - For problems 119-130, set up an equation, an...Ch. 10.CM - For problems 119-130, set up an equation, an...Ch. 10.CM - For problems 119-130, set up an equation, an...Ch. 10.CM - For problems 119-130, set up an equation, an...Ch. 10.CM - For problems 119-130, set up an equation, an...Ch. 10.CM - For problems 119-130, set up an equation, an...Ch. 10.CM - For problems 119-130, set up an equation, an...Ch. 10.CM - For problems 119-130, set up an equation, an...Ch. 10.CM - For problems 119-130, set up an equation, an...Ch. 10.CM - For problems 119-130, set up an equation, an...

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