

1. 
If y varies directly as x and y = 21 when x = 5, find x when y = 42. 


A. 
5 
B. 
21 


C. 
10 
D. 
4.2 


Hint 


2. 
Suppose y varies directly as x, and y = 319 when x = 29. Write a direct variation equation that relates x and y. 


A. 

B. 
y = 11x 


C. 
y = 11x 
D. 



Hint 


3. 
Use the direct variation equation y = 22x to find x when y = 88. 


A. 

B. 



C. 
x = 4 
D. 
x = 4 


Hint 


4. 
Use the direct variation equation to find x when y = 34. 


A. 
x = 153 
B. 
x = 153 


C. 
x =  
D. 
x = 


Hint 


5. 
If Dale Jarrett drives his car 1760 feet on the racetrack in 6 seconds, about how long will it take him to drive 2640 feet, a half mile? 


A. 
18 seconds 
B. 
18 minutes 


C. 
9 seconds 
D. 
6 minutes, 40 seconds 


Hint 


