Question

5. Brandon solved the following system of equations by substitution. His partner Lisette checked his work and said she found an error. What step did Lisette find the
error?

Step 1
Step2
Step 3
Step 4
Step 5

Answer 1

The error was on step 3, and she found the error on step 4.

Explanation: on step 3, the 12 was supposed to be a negative, but it wasn’t. So she solved it on step 4, and added the negative sign.