Question

1.Rezolvaţi prin metoda substitutiei x+3y=-10 |-x+2y=-5​

Answer 1

$\left \{ {{x+3y=-10} \atop {-x+2y=-5}} \right.$

-x=-5-2y

x=2y+5

x+3y=-10

2y+5+3y=-10

5y=-15

y=-3

x=2y+5

x=2*(-3)+5

x=-6+5

x=-1