Question 639888
If 2x+y=8 and x-y=1,then y=
.
2x+y=8 (equation 1)
x-y=1  (equation 2)
.
Solve equation 2 for x:
x-y=1
x=y+1
.
Substitute above into equation 1 and solve for y:
2x+y=8
2(y+1)+y=8
2y+2+y=8
3y+2=8
3y=6
y = 2