Topic 2: Mid-Topic Checkpoint

How do you know if a situation represents a proportional relationship?

*Choose the BEST answer.

• It has equivalent ratios.

• They look similar.

• The graph has a curve.

• It can be written as a fraction.

Does this table show a proportional relationship? If so, what is the constant of proportionality?

• Yes; 5

• Yes; 10

• The quantities are NOT proportional.

Janet, Rosi, and Tanya buy postcards from their favorite souvenir shop. Janet buys 3 postcards for $1.05. Rosi buys 5 postcards for $1.75. Tanya buys 8 postcards for $2.80. Are the cost, y, in dollars and the number of postcards, x, proportional?

• Yes; y = 0.35x

• Yes; y = 0.30x

• Yes; y = 0.40x

• No; They are NOT proportional.

Four movie tickets cost $30.00. Five concert tickets cost $36.50. Does the movie or the concert cost less per ticket? How much less?

• Concert ticket costs $0.20 less per ticket.

• Concert ticket costs $0.30 less per ticket.

• Movie ticket costs $0.20 less per ticket.

• Movie ticket costs $0.30 less per ticket.