Direct Variation

The amount of money earned on a job varies directly to the number of hours worked. If $70.00 is earned in 5 hours, how much money is earned in 22 hours of work?

• $2

• $308

• $1.57

• $265

Tags

CCSS.8.EE.C.7

CCSS.8.F.B.4

CCSS.8.SP.A.3

In a direct variation, y=39 when x=3.  Find the value of y when x=2.

• 26
• 3
• 58.5
• 2

Tags

CCSS.8.EE.C.7

CCSS.8.F.A.1

CCSS.8.F.B.4

Is this a direct variation equation?

y=2x

• yes

• no

Tags

CCSS.8.EE.B.5

CCSS.8.EE.B.6

CCSS.8.F.A.3

CCSS.8.F.B.4

Which of the given graphs is a direct variation?

• A

• B

• C

• D

Tags

CCSS.8.EE.B.5

CCSS.8.EE.B.6

CCSS.8.F.A.3

CCSS.8.F.B.4

Write the direct variation equation for the table given.

• y = 1/3x

• y = 3x

• y = 1/2x

Tags

CCSS.8.EE.B.5

CCSS.8.EE.B.6

CCSS.8.F.A.3

CCSS.8.F.B.4

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?

• 50 kg water
• 72 kg water
• 94 kg water
• 150 kg water

Tags

CCSS.8.EE.B.5

CCSS.8.EE.C.7

CCSS.8.F.A.3

CCSS.8.F.B.4

What is the constant of variation, k (in miles per hour) based on the table?

• 45

• 90

• 135

• 2

Tags

CCSS.8.EE.B.5

CCSS.8.F.B.4

CCSS.8.SP.A.3

If y varies directly with x, and y = 8 when x = -4, what is x when y = -48?

• -96

• 24

• 96

• -24

Tags

CCSS.8.EE.C.7

CCSS.8.F.B.4

What does the Direct Variation Equation look like?

• y= kx

• y = mx + b

• Ax + By = C

• y - y₁= m( x - x₁)

Tags

CCSS.8.EE.B.6

What is the constant of variation (k)?

• 8

• 16

• 24

• 2

Tags

CCSS.8.EE.B.5

CCSS.8.EE.B.6

CCSS.8.F.B.4