Question 132353
a+b=18 Given
a-b=10 Given

Solution steps: 
Add the two equations to eliminate b and yield an equation in a alone.
Solve for a.
Replace a in one of the original equations to solve for b

a+b=18
a-b=10
--------
2a  = 28
a = 14

14+b=18
b=4

answer 14,4