### Home > ACC7 > Chapter 4 Unit 2 > Lesson CC3: 4.1.7 > Problem 4-69

4-69.

For a tile pattern with the rule (where

*represents the figure number and*

*represents the number of tiles), which figure number has*

Given information: number of tiles

*figure number*

Substitute the given information.

number of tiles

Solve for .

Figure

Check your answer.