Direct and Inverse Practice

What is the constant (k) in this inverse variation?
y = 400/x

• x

• y

• 400

• Not enough information given

Which of the following is NOT a direct variation?

• y = -2x

• y = 1/2x

• 2x + 3y = 2

• 3y = 4x

Given that y varies inversely with x, if x =7 and y = 4, what is y when x = 2?

• 14

• 10

• 2

• -14

If the both quantities are increasing or decreasing then its called as

• Direct Variation

• Inverse Variation

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

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

In this type of variation, x and y are doing the opposite- when one is increasing, the other is decreasing

• inverse

• direct

• neither

What does the Direct Variation Equation look like?

• y= kx

• y = mx + b

• y = b

• y = x

Determine the type of variation:

• Direct

• Inverse

• Neither

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