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X+2y=7-equation 1 x-2y=1-equation 2

equation 1-2 x+2y=7 x-2y=1 now, look in eq 2 there +x becomes -x -2y becomes +2y +1 becomes -1 so, both x cancels, 2y+2y=4y 7-1=6 so 4y=6 y=6\4 y=3\2 from equation 1 (or u may take 2) x+2y=7 x+2(3\2)=7 x+3=7 x=7-3 x=4