Решите методом постановки систему уравнений

Ответ:

Объяснение:

1) $\left \{ {{x=8+5y} \atop {2(8+5y)+4y=30}} \right. ; \left \{ {x=8+5y} \atop {14y=14}} \right. ;\left \{ {{y=1} \atop {x=13}} \right.$

2) $\left \{ {{y=2x-1} \atop {7x-6(2x-1)=-4}} \right. ;\left \{ {{y=2x-1} \atop {-5x=-10}} \right. ;\left \{ {{x=2} \atop {y=3}} \right.$

3) $\left \{ {{b=10-2a} \atop {5a-3(10-2a)=14}} \right. ;\left \{ {{b=10-2a} \atop {11a=44}} \right. ;\left \{ {{a=4} \atop {b=2}} \right.$

4) $\left \{ {{2x=2+3y} \atop {2(2+3y)-5y=1}} \right. ;\left \{ {{2x=2+3y} \atop {y=-3}} \right. ;\left \{ {{y=-3} \atop {2x=-7}} \right. ;\left \{ {{x=-3,5} \atop {y=-3}} \right.$