SOLUTION: Why must a graph of a relationship run through the origin in order for it to be proportional?

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Question 925206: Why must a graph of a relationship run through the origin in order for it to be proportional?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Any equation that doesn't go through the origin does not have the form,
y=kx or k=y%2Fx and therefore can't be used for proportions.