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OpenStudy (anonymous):
Solve the following system. x - y = 10 x + y = 4 Answer (-3, 7) (7, -3) (-7, 3) (7, 3)
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Directrix (directrix):
(7, -3) See graph at: http://www.wolframalpha.com/input/?i=%28x+-+y+%3D+10%29+and+%28x+%2B+y+%3D+4%29
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