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Actually, that's the most basic way to solve the system of equation. I could delve in deeper using matrices and crap like that.. But there's no need to do that when you can solve it simply using a graph.
I would've posted a screenshot of the graph that I pulled up on an online graphing calculator, but I didn't think it would be worth it since it was obviously meant as a lower level problem. Still, I love systems of equations. The only part I hate about them is substitution, substitution is evil. I'll do anything but substitution. Cramer's rule is my favorite (Using matrices).
But, I'm blabbing on about it, so I'll just leave it be. : P