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posted by jackie Monday, July 5, 2010 at 5:58pm.

solve by elimination 2r - 9s = -17 9r + 2s = 51

18 r - 81 s = - 153 18 r + 4 s = 102 -------------------- 0 r - 85 s = - 255 s = 255/85 = 3 now go back and get r

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