Question

2x-7y=3; 3x+4y=-10 способом сложения

Answer 1

х+11у=-13                        2х-7у=3

х=-13-11у                        2(-13-11у)-7у=3

х=-13-11*(-1)                  -26-22у-7у=3

х=-13+11                        -29у=29

х=-2                                у=-1