Write a direct variation equation that relatts x and y. Assume that y varies directly as x. then slove. If y= -30 when x= -5, find y when x= -3
y = kx where k is a constant.
Plug in -30 for y and -5 for x .
-30 = k(-5) Solve for k .
-30 / -5 = k
6 = k
So we know that
y = 6x To find y when x = -3 , plug in -3 for x .
y = 6(-3)
y = -18
