A graph that has an originality.(0,0) (this is the main thing. More below!!)
Step-by-step explanation:
it might be positive or negative. it should also be linear.
it also should not have a y-intercept.( the point where the line crosses the y axis)
so for example a graph with an equation of y =3x or y=-3x is proportional. It has an originality since there is no y-intercept which is b in an equation. It also has a steady rate or slope of 3 which makes it linear.
