Variation Part 2

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

• 121
• 4
• 100
• 6

a varies inversely as the square of b. If a is 1 when b is 3, find a when b is 5. 

• 0.36
• 9
• 25
• 36

 y varies directly with x, and y is 16 when x is 32. Which equation represents this situation?

• y=32x
• y=16x
• y=2x
• y=(1/2)x

What does the Direct Variation Equation look like?

• Y= kx
• y = mx + b
• y = b
• y = x

The equation    
w = 10chs  represents:

• direct variation
• inverse variation
• joint variation
• none of these

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

Trina's paycheck earnings varies directly as the number of hours she works. If she works 19 hours and earns $187.15, what should she earn if she worked 40 hours? 

• $394
• $440
• $472.80
• $512.20

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

The current in an electrical conductor varies inversely as the resistance of the conductor. What is the current when the resistance is 42 ohms, if the current is 4 amperes when the resistance is 168 ohms?

• 21 amperes
• 17 amperes
• 24 amperes
• 16 amperes

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

• y=kz²/wx
• y=kz/wx
• y=wx/kx²
• y=wx/kz