A. Les couples (2;1). (-1;-5) ; (0;-3) et (-2;3) sont-ils solutions des équations suivantes? .2x - y=1
.3x + y=-3
b.Le couple (-2; 3) est il solution des systeme suivants?
.x + y=1 .x - y=1 .4x + 3y=1
5x + 3y =-1 7x + 4y =-2 2X - y=-6

si'il vous plait expliquez moi
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