### Home > A2C > Chapter 2 > Lesson 2.1.1 > Problem 2-15

2-15.

Jackie and Alexa were working on homework together when Jackie said, “*I got *

*as the solution, but it looks like you got something different. Which solution is right*?”

“*I think you made a mistake*,” said Alexa. Did Jackie make a mistake? Help Jackie figure out whether she made a mistake and, if she did, explain her mistake and show her how to solve the equation correctly. Jackie’s work is shown at right.

Remember that

You can tell if your answer is correct if you substitute it back into the original equation and it checks.