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put both equations in standard form

y - 3x = -5 (equation 1)

-7y + 21x = 35 (equation 2)

multiply equation 1 by 7 (this is done so either one of your variables will cancel... if both variables cancel then these lines are parallel)

7y - 21x = -35

-7y + 21x = 35

0 = 0

therefore your lines are parallel

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Q: Where does y equals 3x-5 and 21x-35 equals 7y intersect on a graph?
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