Hi all, new here. I've recently began a home study AS/A2 course in mechanical mathematics after being outside of formal education for almost 7 years. I'm currently having problems with remembering methods taught at basic AS level, and in particular the solution and method to this pair of simultaneous equations:

5x + 4y + 5 = 3x - 7y, 4(x+3y) + 3 = 5x

Help would be greatly appreciated!