Question

Допоможіть розв‘язати

Answer 1

3(x+y)-4(x-y)=5
4(x+y)-3(x-y)=9

3x+3y-4x+4y=5
4x+4y-3x+3y=9

7y-x=5
7y+x=9

x=7y-5
7y+(7y-5)=9

x=7y-5
14y=14

x=7•1-5
y=1

x=2
y=1