Question

If y=-16 when x=4 find x when y=48

Answer 1

x= -12

Explanation:

Assuming this is a direct variation

y = kx

When y = -16 x =4 we can find k

-16 = k*4

Divide each side by 4

-16/4 = 4k/4

-4 =k

So

y = -4k

Y = 48

48 = -4x

Divide each side by -4

48/-4 = -4x/-4

-12 =x