Question

Решите систему. 4x+3y=2(сверху) x-4y=-9(снизу)

Answer 1

$left { {{4x+3y=2} atop {x-4y=-9}} right. left { {{4x+3y=2} atop {19y=38}} right. left { {{x=-1} atop {y=2}} right.$

Answer 2

4х+3у=2
х-4у=9

4х+3у=2
4х-16у=-36

19у=38
у=2

4х+3*2=2
4х=2-6
4х=-4
х=-1