Midterm Review- Proportional Relationships

What makes a graph proportional?

• Linear
• The line goes through the origin
• Curvy line
• straight line and goes through the origin

Is the graph proportional or non proportional?

• proportional
• non proportional

Write an equation for this relationship.

• y=1/5x
• y=1/2x
• y=2x
• y=5x

The school office ordered 24 boxes of pens. Their total cost was $191.52. What was the cost of 1 box of pens?

Hint: Find the unit rate.

• $7.02
• $7.20
• $7.98
• $8.00

What is the constant of proportionality?

y = 14x

Mikey is swimming a relay race. Here are his stats:

50 meters in 10 seconds

150 meters in 30 seconds

300 meters in 60 seconds

Is this a proportional relationship? If so, find the constant of proportionality?

• Not a proportional relationship; no constant

• It is a proportional relationship; no constant

• It is a proportional relationship; the constant is 5 meters every 1 second.

• Not a proportional relationship; the constant is 50 meters every 10 seconds.

Express $15 for 10 gallons as a unit rate.

• $5 per gallon
• $1.50 per gallon
• $3 for 2 gallons
• $1000 per ton

A car travels 195 miles in 3 hours. Assuming that the distance the car travels varies directly with the time, how far will the car travel in 5.5 hours?

• 357.5 miles
• 300 miles
• 220.5 miles
• 195 miles

Write an equation relating the total cost, y, to the number of days, x.

• y = 18x
• y = 18.50x
• y = 22.50x
• y = 22x

The graph below shows the relationship between the pounds of cheese bought at Jersey Mike’s, and the total cost, in dollars, for the cheese.

• A

• B

• C

• D

• E