how do i do this

Question

Write a direct veneration equation that relates x and y assume that y varies directly as x then solves.

if y= -12 when x =-2 find x when y =42

Answer 1

y = kx where k is a fixed number constant

 

-12 = k(-2)

 

k = -12/-2 = 6

 

SO y = 6x

 

42 = 6x

x=42/6 = 7