Well the answer I came up with was (-4, -1). When you find the solution to that I think it means like, you're finding where they both intersect. Maybe not. But ummm.. I could be wrong.
Here's a website that will really help you forever. It's an online graphing calculator. It's called desmos.com. It will really help you be able to look at your graphs and change them easily. I'd be happy to help you figure out some math, I just need to do some research. Let me know if I can help you with anything else Robbins.
By the way, don't stress so much about this stuff. It's all just numbers. If you can do basic math, you will be just fine out in the "real world".