Question

?!?!?#?#??!??!?#?#??#?#?!??!?!!??!!?!??!?!?!?!

Answer 1

$left { {{3x-2y=11}, atop {x+5y=15};} right. Rightarrow left { {{3x-2y=11} atop {-3x-15y=-45}} right. Rightarrow left { {{-17y=-34} atop {x+5y=15}} right. Rightarrow left { {{y=2} atop {x+10=15}} right.$

Ответ.$left { {{y=2} atop {x=5}} right.$