Question

(y +30=2 (2x + 3y = 7​

Answer 1

*Решение способом подстановки*

(y+3x=2
(2x+3y=7

(y=2-3x
(2x+3(2-3x)=7

(y=2-3x
(2х+6-9х=7

(у=2-3х
(-7х=1

(х=1/-7
(у=4/7