1)x+y=14
x-y=8
x=14-y
14-y-y=8
x=14-y
14-2y=8
x=14-y
2y=6
x=14-y
y=3
x=14-3
y=3
x=11
y=3
2)x-y=7
x+y=23
x=7+y
7+y+y=23
x=7+y
7+2y=23
x=7+y
2y=16
x=7+y
y=8
x=7+8
y=8
x=15
y=8
3)x+y=32
x-y=14
x=32-y
32-y-y=14
x=32-y
32-2y=14
x=32-y
2y=18
x=32-y
y=9
x=32-9
y=9
x=23
y=9