Question

{×-у=4; 3у+2×=-7 как решить?

Answer 1

$displaystyle left { {{x=4+y} atop {3y+2(4+y)=-7}} right. Rightarrow left { {x=4+y} atop {3y+8+2y=-7}} right. Rightarrow left { {{x=4+y} atop {3y+2y=-7-8}} right. \\\Rightarrow left { {x=4+y} atop {y=-3}} right. Rightarrow left { {{x=1} atop {y=-3}} right.$