Compare Functions to Determine the Better Buy

The video tutorial addresses a standardized math test question involving function comparison. It is divided into four parts, each focusing on different aspects of the problem. Part A involves determining the cost per shirt at a local store using a graph. Part B requires writing a function for the total cost of shirts from the local store. Part C involves creating a function for the cost of buying shirts online, including a shipping fee. Part D compares the total costs from both sources to determine the cheaper option. The tutorial concludes that buying online is more cost-effective.

What is the cost of one shirt at the local store based on the graph?

• $3

• $5

• $7

• $10

Which equation represents the total cost of buying x shirts from the local store?

• y = 7x

• y = 10x

• y = 5x

• y = 3x

What is the slope in the function representing the cost of buying shirts online?

• $3.50

• $5.50

• $4.50

• $2.50

What is the y-intercept in the function for the online shirt purchase?

• $5.00

• $7.50

• $11.50

• $9.50

How much would it cost to buy 20 shirts from the local store?

• $110

• $100

• $90

• $80

How much would it cost to buy 20 shirts online including shipping?

• $70.50

• $80.50

• $90.50

• $100.50

Which option is cheaper for buying 20 shirts?

• Local store

• Online store

• Both cost the same

• Cannot be determined