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Anonymous
x+4y = 1
2x-2y = -8
Mutiply all terms in the bottom equation by 2 and then add them both together:
5x = -15
x = -3
Substitute the value of x into the equations to find the value of y:
So: x = -3 and y = 1
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(1, 1)
(-1, 5)
(2, -1)
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