Inverse and Joint Variation

Tell the type of variation that's shown:

xy = 5

• Direct Variation

• Inverse Variation

• Joint Variation

• None of the above

Tell the type of variation that's shown:

y/x = 8

• Direct Variation

• Inverse Variation

• Joint Variation

• Non of the above

Tell the type of variation that's shown:

x + y = 8

• Direct Variation

• Inverse Variation

• Joint Variation

• None of the above

The variables x and y vary inversely. x = 7, when y = 2. Write a specific equation relating x and y.

• y = 14x

• y = 14/x

• y = 7/2 x

• y = 2/7 x

z varies jointly with x and y. z = 12 when x = 8 and y = 6. Write a specific equation.

• x = 4zy

• x = 1/4 zy

• z = 4xy

• z = 1/4 xy

Write an equation for the given relationship:

x varies directly with y and inversely with z.

• x = ayz

• x = ay/z

• x = az/y

• y = ax/z

Write an equation for the given relationship:

w varies inversely with y and jointly with x and z.

• w = az/xy

• w = axzy

• w = (axz)/y

• w = az/y

The variables x and y vary inversely. x = -4 when y = -5/4. Find y when x = 3.

• y = 5/3

• y = 3/5

• y = 2

• y = -2

Z varies jointly with x and y. z = 75 when x = 5 and y = -3. Find z when x = -4 and y = 5.

• z = 1/50

• z = 1/100

• z = 50

• z = 100

Determine what type of variation the ordered pairs listed below represent:

(12, 132), (18, 198), (23, 253), (29, 319), (34, 374)

• Direct Variation

• Inverse Variation

• Joint Variation

• Combined Variation