Directly and Inversely Proportional Relationships

What is the value of y when x = 7?

• 30

• 35

• 25

• 36

Is the graph proportional, inversely proportional or neither?

• Inversely Proportional

• Proportional

• Neither

What is the rate of change for the following graph?*Hint: you can make a table with your input and output. Or you can use the equation y = kx to solve for your constant.

• 16

• 1

• 8

• 2

Find the rate of change (or constant), and solve for the missing output.

• 27

• 72

• 90

• 88

y in inversely proportional to x, and y = 9 when x = 4. What is the value of y when x = 3? Remember the formula for inverse relationships is y = k/x

• 12

• 4

• 36

• 9

Susan and Joe both insure their properties with the Oklahoma Insurance Company. The cost of house insurance premiums with the Oklahoma Insurance Company is directly proportional to the value of the property being insured. Susan pays premiums of $80 per month on her property valued at $160,000. How much does Joe pay on his property valued at $323,000?

• $2,000

• $75.20

• $161.50

• $44.60

g is directly proportional to b Given g=20 when b=4. Find g when b=7

• 35

• 5

• 15

• 23

Is y=kx proportional?

• Yes

• No

• 8

• 4

If two quantities are inversely proportional, what happens to one quantity when the other is halved?

• It remains the same.

• It doubles.

• It halves.

• It quadruples.