Direct and Inverse proportion

y is directly proportional to x, and y = 24 when x = 4.

What is the value of y when x = 3?

• 18

• 20

• 23

• 43

P is directly proportional to T.

Which of the following could be the graph connecting T and P?

• 
• 
• 
• 

y is inversely proportional to x, and y = 8 when x = 3

What is the value of y when x = 4?

• 6

• 7

• 9

• 10.67

The time (t days) required to build a house is inversely proportional to the number of builders (n), all working at the same rate.

If there are 6 builders, it takes 80 days to complete the house.

How many builders must be employed to build the house in just 16 days?

• 1.2 builders

• 25 builders

• 30 builders

• 36 builders

Name the constant of proportionality.

• 20
• 40
• 16
• 35

Name the constant of proportionality.

• 8
• 16
• 6
• 3

Does the table represent a proportional relationship?

• Yes.
• No.

• 1
• 3

Which picture shows 2/8?

• green
• blue
• purple
• pink

Solve the proportion.

• k=5
• k=3.3333333
• k=60
• k=90