Let's start with a problem that's half done already... We already know what y is:
We just need to figure out what the x is. Substitution! Take the y guy and stick it into the first equation:
| This gives |  |
. Solve for x! |
Let's double-check that:
| So, the solution to our system is |  |
. |
Remember that this is a point where two lines intersect.
TRY IT:
Solve by substitution:
