Question

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

Answer 1

The answer is

→ No property

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.

`(-2)/(2) = (6)/(-2)`

`= x = -3`

Result:

`x=-3`

There is no Step 4.