Direct & Inverse Variation

y varies directly as x. If y=20 when x=4, find the constant of proportionality. 

• k=4
• k=1/4
• k=1/5
• k=5

Y is directly proportional to the square of z and inversely proportional to w and x

• y=kz^^2/wx
• y=k_z/wx
• y=wx/kx^2
• y=wx/kz

What kind of equation is this?
xy=8

• Linear Equation
• Direct Variation
• Inverse Variation
• Joint Variation

Classify the equation:
15x=3y

• Direct Variation
• Inverse Variation
• Joint Variation
• Linear Equation

If y = 15 when x = 12 find y when x = 32.

• 40
• -40
• 5
• -5

Tags

CCSS.6.EE.C.9

 Y varies inversely with x, and y is 0.5 when x is 4. Which equation represents this situation?

• y=2x
• y=2/x
• y=4x
• y=x/2

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.2

CCSS.HSF.BF.A.1

CCSS.HSF.LE.A.2

Suppose y varies directly as x.
If  y = 22.5 when x = 15, find y when x = 20.

• 1.5
• 337.5
• 30
• 16.875

Tags

CCSS.7.EE.B.4

CCSS.7.RP.A.2

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

• 300
• 75
• 1,875
• 12

Tags

CCSS.7.EE.B.4

CCSS.7.EE.B.3

CCSS.7.NS.A.2

Classify the equation:
15x=3y

• Direct Variation
• Inverse Variation
• Joint Variation
• Linear Equation

The number of people working and the number of hours it takes to finish the work.

• Direct Variation
• Inverse Variation