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xy = 4

x + y = -3

x = -3 - y = -(y+3)

-y2 + 3y - 4 = 0

which can be factored to

(4 - x)(x + 1) = 0. So x has two possible solutions: x = 4 or x = -1. If x = 4, then y = -1. If x = -1, then y = 4.

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13y ago
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Q: What multiplies to 4 and adds to -3?
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