Question

Which phrase best describes the graph of a proportional relationship

Answer 1

In proportional, it is y/x=k or y=kx
basically it is like y=mx+b, it is  a line

Answer 2

the complete question is

Which phrase best describes the graph of a proportional relationship?

A.a straight line passing through the origin

B.a straight line

C.a curve

D.not a straight line

we know that

A relationship between two variables, x, and y, represent a proportional relationship (direct variation) if it can be expressed in the form

$\frac{y}{x}=k\\ or\\ y=kx$

the equation $y=kx$ is a straight line passing through the origin with slope equal to k

therefore

the answer is the option

A.a straight line passing through the origin