Direct and Inverse Relationship

Which equation exhibits a direct proportion?

• y = 5x - 2

• y = 3/4 x

• y - x = 4

• x = 6

What kind of relation exists between y and x ?

• Linear equation

• Direct proportion

• Inverse proportion

• Joint variation

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

• x

• y

• 400

• Not enough information given

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

• yes

• no

Is the given table a direct variation? If so, what is the constant?

• Yes; 1/4

• Yes; 4

• Yes; 2

• No

Is the given table a direct or inverse variation? What is the constant of variation?

• Direct, 12

• Inverse, 12

• Direct, 1/12

• Inverse, 1/12

Which of the following represents inverse variation?

• y = kx

• y = k/x

• y = x/k

• y = mx + b

If y varies inversely as x and x=5 when y=20, then what is the constant of variation, k?

• 121

• 4

• 100

• 6

Assume y varies inversely with x. If x=7 when y=4, what is y when x=2 ?

• 4

• 14 

• 7

• 28

Write an equation for this relationship.

• y=4x

• y=1/8x

• y=1/4x

• y=8x