October 2018 2 21 Report

b)x+y =2 x-y=0 c)x+2y=9 -x-3y=16 d)-x+y=5 x+y=5 e)2x -1,1y=0,7 0,5x+1,1y=4,3 f)x-2y=4 -x+3y=0


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