Precalc 11 – “Week 12”

This week in Precalculus 11 we learned about how to solve quadratic systems.

There are multiple ways of find the solution for where both lines cross, like graphing or elimination. However in class we learned about the process of substitution.

Which is removing one variable from the equation and then solving for the remaining unknown variable. After that using that answer to find the first unknown variable.

ex.

$y=2x+5$

$y=x^{2}+6x+9$

$2x+5=x^{2}+6x+9$

$0=x^{2}+4x+4$

$x=2$

$y=9$