OK, let's do one all the way from the beginning:

We've got to rewrite one of these equations so it's like

y = x stuff     or    x = y stuff

And here's the key to making your life happier:

If possible, you want to pick a guy to solve for that doesn't create fractions.

Check it out:

If we solve for this guy...                    it's nice and clean!

Now, you stick this guy   into circled guy!

I think we've got it...  (3, 5)...  I'll let you check it!  * In both equations!