Question

Решите систему уравнений
7х+2у=1
17х+6у=-9

Answer 1

$left { {{7x+2y=1} atop {17x+6y=-9}} right.$$left { {{-21x-6y=-3} atop {17x+6y=-9}} right.$$left { {{-4x=-12} atop {7x+2y=1}} right.$$left { {{x=3} atop {2y=1-7*3}} right.$$left { {{x=3} atop {y=-10}} right.$