Question

Решите систему уравнений способом подставления
{10p+7q=-2
{2p-22=5q

Answer 1

$left { {{10p+7q=-2} atop {2p=5q+22}} right. ; left { {{5*(5q+22)=-2-7q} atop {2p=5q+22}} right. ; left { {{25q+110=-2-7q} atop {2p=5q+22}} right. ; left { {{25q+7q=-2-110} atop {2p=5q+22}} right.$ ; $left { {{32q=-112} atop {2p=5q+22}} right. ; left { {q=-3.5} atop {2p=5q+22}} right. ; left { {q=-3.5} atop {2p=5(-3.5)+22}} right. ; left { {q=-3.5} atop {2p=-17.5+22}} right. ; left { {q=-3.5} atop {p= frac{4.5}{2} }} right.$ ; $left { {q=-3.5} atop{p=2.25}} right.$