Question

Решите систему уравнения -3х+5у=-9 11х-3у=-13

Answer 1

в конце y=6,8
(0,2;6,8)

Answer 2

$\left \{ {-3x+5y=-9}|*3 \atop {11x-3y=-13}|*5} \right.\\+ \left \{ {-9x+15y=-27} \atop {55x-15y=-65}} \right.\\\\-9x+15y+55x-15y=-27-65\\46x=-92 /:46\\x=-2\\\\11*(-2)-3y=-13\\-22-3y=-13\\-3y=-13+22\\-3y=9\\y=-3$

Ответ:

$\left \{ {{x=-2} \atop {y=-3}} \right.$