Math Algebra 8.2.1.2

5. y = 3x + x. In the equation above, y represents the cost (in dollars) of buying x CD’s at a CD store sale. How much more expensive are 4 CD’s than 2 CD’s?

A. 2 dollars

B. 4 dollars

C. 6 dollars

D. 8 dollars

6. f(y) = 2y + 12. In the equation above, if the independent variable increases by 4, how much will the dependent variable increase by?

A. 4

B. 8

C. 12

D. 20

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