You're asking in two variables, yes? Then I'll give out a problem...
PROBLEM: 1) x - 2y = 3; 2) 3x + y = 1
SOLUTION: It depends upon you. You can use GRAPHING, where you would list the points which are the possible solutions to the problem - at least two points would do.
You could also use SUBSTITUTION, where you have to substitute a variable to solve the other variable.
You could also use ELIMINATION, where you could cross out a variable to solve the other one.
1) Points: (3,0) and (1, -1)
2) Points: (0,1) and (1,0)