4.2b Inverse Variation

x and y vary inversely. Given (5, 20), what is the constant k?

• 4
• 5
• 25
• 100

Tags

CCSS.7.EE.B.3

CCSS.7.EE.B.4

Does the equation show an inverse variation? 
y=10/x

• yes
• no

Tags

CCSS.HSF-LE.A.1B

Given the following equation, identify the constant k.
y = 54/x

• There is one.
• k = x
• 54
• y = k

Tags

CCSS.HSF-LE.A.1B

Given (32, 15) and (12, y). Find the constant k, and then find the missing y value.

• 40
• 48
• -40
• -48

Tags

CCSS.HSA.CED.A.2

CCSS.HSA.REI.C.6

a varies inversely as the square of b. If a is 1 when b is 3, find a when b is 5. 

• 0.36
• 9
• 25
• 36

y varies inversely as x, if y = -3 when x = -6, find y when x = 14.

• 11
• -11
• 9/7
• 7/9

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.2

CCSS.HSA.REI.A.1

If y varies inversely as x and y=2 as x = 8, find x when y= -7

• 1/4
• 4
• 16
• 16/-7

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.2

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.3

True or False:
An inverse variation is always a curve and a direct variation is always a line?

• True
• False

Tags

CCSS.HSA.REI.D.10

If y varies inversely as x, and y = 32 when x = 3, find x when y = 15.

• 3/5

• 8/5

• 16/5

• 32/5

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.3

CCSS.HSA.SSE.A.1

If x varies inversely as the square root of y, and x = 9 when y = 121, find x when y = 81.

• 7

• 11

• 13

• 17

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.2

CCSS.HSF.BF.A.1