Question

Which equation represents a proportional relationship a)y=5+x ,b) y=4x, c)y=7x2 ,d)y=2-x

Answer 1

If x and y are proportional then the quotient y and x is constant.

$\dfrac{y}{x}=a=constant$      multiply both sides by x

$y=ax$

Your answer is b) y = 4x