Question

The variables x and y vary directly. Write an equation that relates x and y. Then find y when x = 3.

Answer 1

1. x =6, y=-8

Answer 2

if y varies directly as x
then y=kx where k is the constant of proportionality
we need to find k first with the help of x =6, y=-8

Answer 3

thus -8=k*6 or k=-4/3
hence y=(-4/3)*x

Answer 4

now we need y when x=3
thus y=(-4/3)*(3)=-4

Answer 5

so the answer is y=-4/3x =a and y = -4