Let's just do one and you'll see
how it works:
See how these guys are the same,
but with a different sign?
If we add the two equations -- straight down, those x critters are going to drop right out!
Just add "like terms" and drag the "=" down to:
We've got one of them... Now, we just need to get the x. To do this, you can stick the y into either of the original equations...
The second equation is easier:
It looks like the answer is (1, 6).
Check it! (In BOTH equations!)
TRY IT:
Solve by elimination:
* Notice that the y is ready to drop out!