CPM Homework Help : CC3 Problem 4-69

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?

Hint:

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

Step 1:

Substitute the given information.
number of tiles $=6$ (figure number) $+4$
$40=6x+4$

Step 2:

Solve for $x$ .

Answer:

$x=$ Figure $6$

Reminder!:

Check your answer.