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3-87.

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

1. $y=5x-2$
$y=2x+10$

Use the Equal Values or Substitution Method.

Solve for $x$. If you need help doing so, refer to the Math Notes box in Lesson 2.1.3.

$x=4$

Substitute $4$ for $x$ and solve for $y$.
Repeat the same steps for part (b).

1. $x=−2y−1$
$2x+y=−20$

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