### Home > MC2 > Chapter 6 > Lesson 6.2.2 > Problem 6-90

6-90.

Recall the Equation Mat from problem 6-89.

Each group of (*x* + 1) corresponds to each group of 4.

*x* + 1 = 4

Substitute your answer from problem 6-89 into the equation above and see if the equation is true.