Question

Решите уравнение:
{2/3х -4/9у=-6
{-4x-2/3у=26

Answer 1

2(3x-y)-5=2x-3y

5-(x-2y)=4y+16

2(3x-y)-5=2x-3y

4x+y-5=0

y=-4x+5

5-(x-2y)=4y+16

-11-x-2y=0

-11-x-2*(-4x+5)=0

-21+7x=0

x=21/7

x=3