Question

topic 4 lesson 2 - solving systems by substitution quiz b

1. x = -2

3x - 3y = 18

Explanation:

Step1: Substitute $x=-2$ into equation

Substitute $x=-2$ into $3x - 3y = 18$:
$3(-2) - 3y = 18$

Step2: Simplify left-hand side

Calculate the product term:
$-6 - 3y = 18$

Step3: Isolate the $y$-term

Add 6 to both sides:
$-3y = 18 + 6$
$-3y = 24$

Step4: Solve for $y$

Divide both sides by $-3$:
$y = \frac{24}{-3}$
$y = -8$

Answer:

$x=-2$, $y=-8$