Question

Решите пожалуйста систему уравнений
А)10х+у=-6
-16х-3у=4

Б)2х+у=-11
21х-у=-5
Дам 64 балла

Answer 1

$left { {{10x+y=-6} atop {-16x-3y=4}} right. ; left { {{y=-6-10x} atop {-16x-3(-6-10x)=4}} right. ; left { {{y==-6-10x} atop {14x=-14}} right. ; left { {{y=-6+10=4} atop {x=-1}} right. ; to ; (-1,4)$


$left { {{2x+y=-11} atop {21x-y=-5}} right. ; slozim; left { {{23x=-16} atop {2x+y=-11}} right. ; left { {{x=-frac{16}{23}} atop {-frac{32}{23}+y=-11}} right. ; left { {{x=-frac{16}{23}} atop {y=-frac{221}{23}=-9frac{14}{23}}} right.$