Linear Equations Direct Proportion Problem SAT ACT Math

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This is a tutorial on how to identify if graphs are directly proportional
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Loved that you explained the reasoning behind why this works like it does, super helpful and good refresher!

scottpollock
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I think to do this a bit quicker is to put the the corresponding values of x and y in a fraction and see if they all form the same fraction in the lowest terms. I know this isn't a reliable way but in a MCQ test, I think this way could save a bit of time.

realblazing