2x+3y=27x-y=11
x=(27-3y)/2
x=y+11
1)(27-3y)/2=y+11
27-3y=2y+22
5y=5
y=1
2)x=1+11
x=12
2(y+11)+3y=27x=y+11
2y+3y=27-22
2x+3y=27
x-y=11
x=(27-3y)/2
x=y+11
1)(27-3y)/2=y+11
27-3y=2y+22
5y=5
y=1
2)x=1+11
x=12
2x+3y=27
x-y=11
2(y+11)+3y=27
x=y+11
2y+3y=27-22
5y=5
y=1
x=12