Proportionality Review

A snack mix recipe calls for 10 cups of cereal and 4 cups of pretzel sticks.

What is the constant of proportionality that relates the number of cups of cereal, y, to the number of cups of pretzel sticks, x?

• .4

• 14

• 2.5

• 6

The graph shows a linear relationship between x and y.

Which equation best represents this linear relationship?

• y = – 1 2x + 4

• y = –2x + 4

• y = –2x + 2

A pilot takes a taxi from the airport to a hotel. The taxi driver charges a $2.50 initial charge plus $2.65 per mile. Which equation can be used to find y, the total cost of the trip, if x represents the number of miles of the trip? ​ ​ ​ (a)   ​

• y = 2.65x + 2.50
• y = 2.50(x+2.65)
• y = 2.50x + 2.65
• y = 2.65x - 2.50

The table shows the relationship between y, the cost to rent a boat, and x, the amount of time the boat is rented.

Which graph best represents the relationship between x and y shown in the table?

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Which equation best represents the relationship between x and y in the graph?

Miranda made a model airplane using a scale in which 0.25 inch represents 2 feet. Which graph shows this relationship?

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The manager of a coffee shop recorded the number of customers who put vanilla creamer or chocolate creamer in their coffee during one hour and classified them by age. The results are shown in the table. What percentage put chocolate creamer in their coffee?​ (a)  

• 70%
• 30%
• 14%
• 75%

• 10 cups

• 40 cups

The owner of a bookstore buys urs for $1.50 each. The owner then resells the used books for 400% of the amount he paid for them. What is the price of a used book in this bookstore?​ (a)  

• $6.00
• $5.50
• $4.00
• $2.10

Of the 250 sheep in a flock, 34% are white. What is the total number of white sheep in the flock?