Solving Systems by Elimination?

[Evanescence_fan]

If someone could just explain to me how to do it, that'd be great. The problem is:
-3x + 5y = 2
3x - 3y = 6

Please and Thank You
okay i figured that one out, so how about
3x - y = 4
-x + 4y = 28
??
Please and Thank You