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x + y = -1 (a) 4x - 3y = 12 (b)

3(a)+(b) gives 3x + 3y + 4x - 3y = -3 + 12 or 7x = 9 or x = 9/7

then x + y = -1 gives y = -1 -x = -1 - 9/7 = -16/7

So, x = 9/7 and y = -16/7

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15y ago

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