Asked by Kaitlyn

An electrician charges a $50 fee to make a service call plus $25 per hour he works. Determine whether the relationship between the two variables is proportional.

Hours Cost($)
1 75
2 100
3 125
4 150

Is this proportional? Because i am not sure. When i plot these points on a graph, they don't pass the origin, which makes it not proportional. But these fractions are proportional otherwise, so is the answer proportional or not?

Answers

Answered by Ms. Sue
Kaitlyn, Jack, anonymous, hiii, anonnnn, anon, Shirley -- or whoever -- you've changed names again! Both Damon and I asked you to keep the same name for your posts.
Answered by Steve
If the line does not pass through the origin, it it not proportional.

you clearly have

y = 25x + 50

That "+ 50" wrecks the proportionality.

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