Question

1. Suppose y varies directly with x, and y = 14 when x = -4. What is the value of y when x = -6

a. -21
b. 10
c. 18
d. 21

Answer 1

the correct answer is 21

Answer 2

direct variation

y = kx

substitute in and solve for k

14 = k(-4)

14/-4 =k

k = -7/2

y = -7/2 x

y = -7/2 * -6

y = 42/2 = 21

Choice D