Question

Margo can purchase tile at a store for $0.89 per tile and rent a tile saw for $36. At another store she can

borrow the tile saw for free if she buys tiles there for $1.29 per tile. How many tiles must she buy for the
cost to be the same at both stores?

Answer 1

90

Explanation:

1. Start by making functions for the numbers

• y=.89x+36
• y=1.29x

2. You can plug in these functions into a graph to figure out the x variable

• The intersection point of the two lines reveals the x and y
• The x would be your answer

3. To check if your x is right, plug it back into the two equations

• .89(90)+36=116.1
• 1.29(90)=116.1