After you're done solving a system, you'll be able to check your answers.
Check it out:
| By magic, we know that |  | is the solution to the system |
Let's check that!
 |  |
It's REALLY important to check all three equations. It's possible to make a mistake and have your answers work in one or two of them!
TRY IT:
Verify that (5, -1, 2) is the solution to
