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posted by lc on Sunday, March 10, 2013 at 8:51pm.

use subsitution system to solve 4x+5y=21 Y=3x-11

4x+5y=21 Y=3x-11 4x + 5(3x - 11) = 21 4x + 15x - 55 = 21 19x = 21 + 55 19x = 76 x = 4 y = (3 * 4) - 11 y = 1

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