To get the number of tiles Figure 12 has, substitute 12 for x in the given rule and simplify.
Kalil's guess is incorrect. Figure 12 has 102 tiles, not 108.
Practice makes perfect
Ms. Cai's class is studying a tile pattern that has the following rule.
y = 10 x - 18
In this rule, the value of y is the number of tiles that Figure x of this pattern has. To find how many tiles will Figure 12 have, let's substitute 12 for x in this rule and simplify.
