### 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. Homework Help ✎

Remember that

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