x + y = 17
x - y = 29
We're going to do substitution.
1. We first put one of these in terms of x or y. Either are fine, but I'm going to do x, and any of the equations are fine, but I'm going to do the first one.
x + y = 17 >> x = -y + 17
2. We plug in this x-value into the other equation, and solve for the variable.
(-y+17) - y = 29
-2y + 17 = 29
-2y = 12
y = -6
3. We now plug the variable we found (y in this case) into the first equation to find the other variable (x).
x + -6 = 17 >> x = 23
In conclusion, the two numbers are 23 and -6.
