Question

Steps to solve an equation are shown below. Which properly justifies step 4? Given: 2x + 9 = 4x + 15

Answer 1

Answer:

The answer is

→ No property

Step-by-step explanation:

Given equation: $2x + 9 = 4x + 15$

What were supposed to do: Which properly justifies step 4.

Solve:

$2x + 9 = 4x + 15$

Step 1: We must subtract 4x on both sides.

$2x+9-4x=4x+15-4x$

$= -2x+9=15$

Step 2: We must subtract 9 on both sides.

$-2x+9-9=15-9$

$= -2x=6$

Step 3: We must divide both sides by -2.

$\frac{-2}{2} = \frac{6}{-2}$

$= x = -3$

Result:

$x=-3$

There is no Step 4.