Question 1 Solve the following systems of equations. Give a geometric interpretation of your solution in each case. (a) 2x + 3y = 2 - 0 4x (b) 2x x 2x 5y + 3y + + + У ++ 2y + N 7z Z = 1 = 4 40

The systems in Exercises 25 and 26 exhibit a lower triangular pattern that makes them easy to solve by forward substitution. (We will encounter forward substitution again in Chapter 3.) Solve these systems. x1=112x1+x2=532x1+2x2+x3=7

Translate to a system of equations and solve: LeBron needs 150 milliliters of a 30% solution of sulfuric acid for a lab experiment but only has access to a 25% and a 50% solution. How much of the 25% and how much of the 50% solution should he mix to make the 30% solution?