Question

Шыгарып бериниздерши

Answer 1

3) $left { {{2x+3y=2} atop {-2x+5y=-18}} right.$ 
    $left { {{y=-2} atop {x=4}} right.$
4) $left { {{x+4y=39} atop {2x-y=15}} right.$
    $left { {{y=7} atop {x=11}} right.$