Direct And Inverse Variation Class 8

What type of proportion does this scenario represent?

The length of time you charge your cell phone

and the battery power

• Direct Proportion

• inverse Proportion

• Joint Proportion

• None of these

g is directly proportional to b

Given g=20 when b=4.

Find g when b=7

• 25

• 35

• 30

• 23

The width of a rectangle varies inversely with its length. if the width is 4 when the length is 18, find the width when the length is 8.

• 9

• 36

• 72

• 81

.The number of pencils sold varies directly as the cost. If 5 pencils cost $0.45, find the cost of 7 pencils.

• Direct

• Inverse

• Both

• None

. What does the Direct Variation Equation look like?

• Y= kx

• y = mx + b

• y=x

• y=b

A dishwasher uses 65 gallons of water to wash 5 loads of dishes. What is the constant of proportion?

• 13

• 65

• 5

• 45

If y varies directly with x and y= 12 when x= 15. What is the value of x when y= 16?

• 11.25

• 19

• 20

• 12.5

Is this proportional?

y=2x

• yes

• no

• maybe

• sometimes

Which of the following represents inverse proportion?

• y = kx

• y = k/x

• y = mx + b

• y=k

The number of kilograms of water in a person’s body varies directly as the person’s mass. A person with a mass of 90 kg contains 60 kg of water. How many kilograms of water are in a person whose mass is 75 kg?

• 55 kg

• 50 kg

• 72 kg

• 94 kg