### Home > AC > Chapter 4 > Lesson 4.1.7 > Problem4-65

4-65.

For a tile pattern with the rule $y = 6x + 4$ (where $x$ represents the figure number and $y$ represents the number of tiles), which figure number has $40$ tiles in it? How do you know?

Given information:
$y$ = number of tiles
$x$ = figure number
$40$ tiles

Substitute in the given information.

number of tiles = $6$ (figure number) $+ 4$

$40 = 6x + 4$

$x$ = Figure 6