CPM Homework Help : CCA Problem 8-21

Find the point of intersection for each system.

$\begin{aligned}[t] &y = 2x - 3 \\ &x + y = 15 \end{aligned}$
Hint (a):
Use the substitution method.
Answer (a):
$\left(6,9\right)$

$\begin{aligned}[t] &3x = y - 2 \\ &6x = 4 - 2y \end{aligned}$
Hint (b):
Use the elimination method.