CPM Homework Help : CC3 Problem 6-39

Ms. Cai’s class is studying a tile pattern. The rule for the tile pattern is $y=10x+8$ . Kalil thinks that Figure 12 of this pattern will have $108$ tiles. Is he correct? Justify your answer.

Hint:

$y=$ # of tiles
$x=$ Figure #

Step:

Substitute the information from the problem into the equation
$y=10x+8$ .

$108=10(12)+8$

$108=120+8$

Answer:

Kalil is wrong.

$108\ne128$ tiles