Question

{10х +15y=-45 {2x-3y=33

Answer 1

$10x+15y=-45\2x-3y=33/*5 \ \ 10x+15y=-45\10x-15y=165\20x=120\x=120:20\x=6\\ 60+15y=-45\15y=-45-60\15y=-105\y=-7 \ left { {{y=-7} atop {x=6}} right.$

Answer 2

10x+15y=-45/:5⇒2x+3y=-9
2x-3y=33
4x=24
x=24/4=6
12-3y=33
3y=12-33
3y=-21
y=-21/3=-7
(6;-7)