Question

−2x+7y=10 3x+7y=2
what is the result of subtracting the second equation from the first

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Answer 1

Since the y values equal each other, subtraction will effectively cancel each other out. We are then left with -5x = 8, and x = -8/5 = -1.6.
If we were to continue to solve for y, just plug in the x value so -2(-1.6)+7y=10 => 7y=6.8 => y=0.971.