Direct and Inverse Variation

A person’s weekly pay is directly proportional to the number of hours worked. Shawn’s pay is $123.00 for 20 hours of work. What is the constant of variation?

• k = 123
• k = 20
• k = 6.15
• k = 0.16

Tags

CCSS.HSF-LE.A.1B

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

• 26
• 3
• 58.5
• 2

Tags

TEKS.MATH.2A.6L

TEKS.MATH.8.5E

TEKS.MATH.A.2D

The amount of money earned on a job is directly proportional 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.HSA.CED.A.1

CCSS.HSA.SSE.A.1

CCSS.HSF.LE.A.2

CCSS.HSF.BF.A.1

CCSS.HSA.REI.B.3

CCSS.HSF.LE.A.1

• direct variation
• inverse variation
• neither direct nor inverse variation

Tags

CCSS.HSA.CED.A.2

CCSS.HSF.IF.B.4

CCSS.HSF.LE.A.1

CCSS.HSF.IF.C.7

CCSS.HSA.REI.D.10

• direct variation
• inverse variation
• neither direct nor inverse variation

Tags

CCSS.HSF.LE.A.2

CCSS.HSF.IF.B.4

CCSS.HSF.IF.C.7

What type of variation does this scenario represent?
The length of time you charge your cell phone
and the battery power 

• direct variation
• inverse variation
• joint variation
• none of these

Tags

CCSS.HSF.BF.A.1

What type of variation does this scenario represent?
The outside temperature
and the number of layers of clothes you need to wear outside to feel comfortable 

• direct variation
• inverse variation
• joint variation
• none of these

What type of variation does this scenario represent?
You and some friends decide to buy 2 pizzas and split the cost evenly.
The number of friends who are sharing the cost of the pizzas
and the amount of money you pay for your share.

• direct variation
• inverse variation
• joint variation
• none of these

Tags

CCSS.HSA.CED.A.2

CCSS.HSA.SSE.A.1

Suppose y varies jointly as x & z. 
If y = -180 when z = 15
and x = -3,
then find y when x = 7 and z = -5.

• -140
• 140
• -4
• 4

Suppose y varies inversely with x.
If y = 150 when x = 2, find y when x = 25.

• 300
• 75
• 1,875
• 12

Tags

CCSS.HSA.CED.A.1