Direct and Inverse proportion

In the equation y = 14x, what is the constant of proportionality?

• y
• x
• 14

Y varies directly as x. If y = 12 when x = 15, what is y when x = 20?

• 4/5

• 17

• 16

• 25

Which equation exhibits a direct proportion?

• y = 5x - 2

• y = 3/4 x

• y - x = 4

• x = 6

Is this a direct proportion?

y=2x

• yes

• no

• Linear equation

• Direct proportion

• Inverse proportion

• Joint variation

Given that y is inversely proportional to x, what is the general equation?

• 
• 
• 
• 

Which statement best describes an inverse proportion relationship between y and x?

• y increases then x will decrease

• y increases then x will increase

• y increases then x will remain the same

• y decreases then x will decrease

y is directly proportional to x. y=2 when x=4, which of the following is the correct equation connecting y and x.

g is directly proportional to b

Given g=20 when b=4.

Find g when b=40

• 200

• 8

• 5

• 16

The number of hours to paint a house varies inversely with the number of painters working. A 2400-square foot house can be painted in 27 hours by 6 painters. How many painters would need to work in order to paint the house in 18 hours?

• 8 painters
• 10 painters
• 9 painters
• 11 painters