Proportional Relationships

Multiple Choice

Are the rates below proportional?

$$\frac{19\ dollars}{2\ lbs}\ \ \ \ \frac{76\ dollars}{8\ lbs}$$  

• Yes. They both have a unit rate of $9.50/1 lb

• Yes. They both have a unit rate of $19/2 lbs. 

• No, they have different unit rates. 

Multiple Choice

Calculate the rate of change for the values in the table.

• No constant rate of change.

• $80 per month.

• $45 per month.

• $41 per month

Multiple Choice

Determine k in the graph shown.

• k = .50

• k = 2

• k = 1

• k = 1.5

Multiple Choice

A dolphin travels through the water of a speed of 25 kilometers per hour. Which representation shows the distance a dolphin can travel at this rate?

• y = x + 25 ; where x represents the time in hours and y represents the distance in kilometers

• In 5 hours a dolphin can travel a distance of 135 kilometers.

Multiple Choice

A recipe says to use 3 cups of flour to make 48 cookies. The constant rate of proportionality that relates the number of cookies made, y, to the number of cups of flour used, x, is ______.

• 16

• 3/48

• 12

• 8

Multiple Choice

Cheddar cheese costs $4.25 per pound. Which equation best represents y, the total cost of x pounds of cheddar cheese?

• y = 4.25 + x

• x = 4.25y

• x = 4.25 + x

• y = 4.25x

Multiple Choice

Which equation matches the graph?

• y = 7x
• y = 42x
• y = 6x
• y = 2x

Multiple Choice

What is the equation y=kx for the table?

• y=1/3x
• y=3x
• y=5x
• y=1/5x

Multiple Choice

What is the constant of proportionality (in miles per hour) based on the table?

• 45
• 90
• 135
• 2

Multiple Choice

What makes a graph proportional?

• Straight Line
• The line goes through (0,0)
• Curvy line
• Straight line and passes through (0,0)

Multiple Choice

What is the unit rate in this proportional relationship?

• 60 miles/1 hour
• 120 miles/ 2 hours
• 1 mile/ 1 hour

Multiple Choice

Write an equation for this situation.

• y=9.75x
• y=19x
• y=19.25x
• y=9.5x