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It looks like you have 2 simultaneous equations with 2 variables:
4x + 8y = 20 and -4x + 2y = -30. Solution is {x=7, y = -1}.
One way to solve:
Add the two equations together, combining like terms: (4x - 4x) + (8y + 2y) = 20-30 --> 0 + 10y = -10 --> y = -1. Substitute this into either of the original equations and solve for x=7, then check in the other equation to make sure you calculated correctly.
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Earn +20 ptsQ: What is 4x plus 8y equals 20 - -4x plus 2y equals -30?
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