Question

Решите систему уравнений а)10х+у=-6 -16х-3у=4 б)2х+у=-11 21х-у=-5 64

Answer 1

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

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