{x+4y=39 {2x-y=15 {2x+3y=2 {-2x+5y=-18

Question

{x+4y=39

{2x-y=15

{2x+3y=2

{-2x+5y=-18

Answer 1

Х+4у=39. Х+4(2х-15)=39 =>х +8х-60=39 =>9х-60-39=0 =>9х=99 х=11
У=2х-15=> у=2•11-15 =>у=22-15 у=7