Question

Suppose y varies directly as x, and Y=80 when x=16 . Which of the following statements is true?

a. The constant of variation is 5.


b. The variable y does not vary directly with x.


c. The constant of variation is -5.


d. The constant of variation is 1/5.

Answer 1

The following answer is B because it shows that it has to multiply the x - axis by the slope (5) to make sure that it can be equat to the y - axis.

y = 5x
y =5(16)
y = 80

(x, y) = (16, 80)