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OpenStudy (anonymous):
Solve -x+4y=33 x+5y=57
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OpenStudy (lgbasallote):
system... -x + 4y = 33 x+ 5y = 57 9y = 90 y = 10 x = 7
Directrix (directrix):
-x+4y=33 x+5y=57 --------- 0 + 9y = 90 y = 10 x + 5y = 57 x + 5(10) = 57 x = 7
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