CPM Homework Help : CCG Problem 2-57

Solve each system of equations below. Then verify that your solution makes each equation true. You may want to refer to the Math Notes box in Lesson 2.1.3.

$\begin{aligned}[t] y=5x-2 \;\,\\ y=2x+10 \end{aligned}$
Step 1(a):
Use the Equal Values or Substitution Method.
Step 2(a):
Solve for $x$ . If you need help doing so, refer to the Math Notes box referenced in the problem.
Partial Answer (a):
$x=4$
Hint (a):
Substitute $4$ for $x$ and solve for $y$ .
Repeat the same steps for part (b).

$\begin{aligned}[t] x=-2y-1 \;\;\\ 2x+y=-20 \end{aligned}$
Step (b):
$2(-2y-1)+y=-20$