CPM Homework Help : INT2 Problem 3-87

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3-87.

Solve each system of equations below. Then verify that your solution makes each equation true.

$y=5x-2$
$y=2x+10$
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 in Lesson 2.1.3.
Partial Answer (a):
$x=4$
Step 3(a):
Substitute $4$ for $x$ and solve for $y$ .
Repeat the same steps for part (b).

$x=−2y−1$
$2x+y=−20$
Step 1(b):
Substitute the value of $x$ in the first equation into the second equation: $2(-2y-1)+y=-20$

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