Question

Which is a graph of a proportional relationship?
Which one?

Answer 1

the bottom left one

Explanation:

it starts at the origin and as the x value increases, the y value increases too

you can easily rule out out the top two just because it doesn't start at the origin

Answer 2

third graph (choice three/bottom left)

Explanation:

Anything with a proportional relationship will always have a constant ratio (ratios will always be equivilent).

you can eliminate any graph that has an x or y intercept other than zero, or does not have a straight line.

The two main rules of a proportional graph or direct proportion is that:

• the line must go through the origin (0,0)
• the graph must be linear