If x + y + z = 25, x + y = 19, and y + z = 18, then find y.
Okay so...
Substitude x=19-y first
19-y+y+z=25
Substitude y=18-z...
19-(18-z)+18-z+z=25
For y=18-z
and you get
y=18-6
Simplification!
y=12
Then we get x=19-y...
x=19-12
19-12=7
BOOM SHAKALAKA
z=6, y=12, x=7
Yay!
