If x and y are in direct proportion and y is 64 when xx is 8, find y when xx is 13.

Answer 1

If x and y direct proportions, you first need to find the slope of the line.

Y=kx

To find k,

64=k8 now divide 64 by 8 and k would equal 8

Now to find what y is if xx is 13: plug in the numbers,

Y=8(13)

Y=104