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Reuben Corwin

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3y ago
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9y ago

Simply solve the first equation either for x, or for y, then replace that in the second equation.

So you can rearrange the first to by x = -4 - y, then substitute this expression for x into the second equation: (-4 - y) - y = 2, so -4 - 2y = 2. Now divide by -2: 2 + y = -1. Subtract 2 from both sides: y = -3. Plug this value into either equation to find x. x = -4 - (-3) = -1. Check in the other equation: -1 - (-3) = 2, which checks out.

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Q: Use the Substitution method to solve the system of equations x plus y equals -4 x - y equals 2?
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