Which graph represents a proportional relationship?

the fourth one does

Step-by-step explanation:

The only graph that shows a proportional relationship is the line that crosses the origin point (0,0). The other graphs are linear functions but not not proportional relationships. The general form of a proportional relationship is y = kx, where k is the proportionality constant.

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

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