Posted by alli on Wednesday, January 5, 2011 at 12:08pm.
-12 x + 6 y = -168 - 3 x - 6 y = 33 --------------------- -15 x = -135 x = +9 -3*9 - 6 y = 33 -27 -33 = 6y y = -10 so (9,-10)
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