Question

3у -2x=69
4,5x+2y=536
решить систему методом сложения

Answer 1

3y-2x=69=> 1.5y-x=34.5
4.5x+2y=536=> x+(2/4.5)y=536/4.5

1.5y-x+x+(2/4.5)y=34.5+536/4.5
(27/18)y + (8/18)y = (621+2144)/18
(35/18)y=2765/18
y= 2765/35
y=79

3*79-2x=69
x=(237-69)/2
x=84