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Rosalinda Blick
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∙ 12y agoxy = 10
x + y = -7
x = -7 - y = -(y+7)
y*-(y+7) - 10 = 0
-y2 - 7y - 10 = 0, which can be factored into
(-y - 5)(y + 2) = 0. So y = -2, -5.
When y = -5, x = -2. When y = -2, x = -5.
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