Question 400488
3x-y+2x+y=4+11  2x+y=11
5x=15 2x+y=11
x=15/5 2x+y=11
x=3 2x+y=11
x=3 2*3+y=11
x=3  6+y=11
x=3    y=11-6
x=3   y=5