Question

Circle the step where the error has occurred. Explain why it is an error and what should have been done to solve the problem correctly. (6 points)

Given
Step 1: Distribute | 2(10−13)+9=−34+60
Step 2: Combine like Terms |20−26+9=−34+60
Step 3: Subtraction Property of Equality | 20−17=−34+60
Step 4: Addition Property of Equality | −17=−34+40
Step 5:Division property of equality. | −51=40
=−51/40

Answer 1

The did not combine like terms correctly.

Step SHOULD'VE went like this:

20-26=-6 & -34+60=26

-6+9=3

3=26

Divide!

3÷3=0 ⇒26÷3=8.6666.....

or (rounded)

the answer would be 8.7