Question

The value of y is directly proportional to the value of x. If y=64 when x= -8, what is the value of y when x = 2 ??

Answer 1

Answer:

y = -16

Step-by-step explanation:

y = kx for proportion questions like this

y = kx

y = 64, x = -8

64 = -8k

Divide by -8 on each side

64/-8 = -8k/-8

-8 = k

Then to find y when x = 2, use y = kx again

y = kx

k = -8

x = 2

y = 2(-8)

y = -16