23. The total cost of 5 notebook and 4 pens is $ 120; the total cost of 8 other identical notebooks and 20 pens is $ 280. What system of equations do allows you to determine the cost of each item? Ax +y = 120, x+ y 280 B 5x 4y = 120.8x-20y 280 C4x + 5y = 120.8x + 20y = 280 D 5x + 4y = 120.8x + 20y = 280 24. Two hamburgers and four cola drinks cost $ 180; five hamburgers and eight colas cost $ 420. What system of equations allows you to calculate the cost of a hamburger and a soda? A 4x + 2v = 420. Ax + 5v = 180 B2x + 4y 180, 5x +8y = 420 C2x 4y 180, 5x-8y 420 D 2x +4y = 420.5x %3! + 8y = 180 %3D

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.