2x-y=1 x+2y=7 y = 2x + 2 3x + 2y = 4 x+3y=0 x-3y=6 8 4x-2y=7 x + 3y = 7 10 2x-2y=5 2x + 3y+ 1 = 0 Ke int lin Chapter 14

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