Name: 
 

Warmups Topic 9.3


Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 1. 
If y varies directly as x and y = 21 when x = –7, find y when x = 56.
a.
–168
c.
168
b.
8,232
d.
–8,232
 

 2. 
If y varies directly as x and y = 21 when x = 3, find y when x = 70.
a.
490
c.
4,900
b.
4,410
d.
10
 

 3. 
If y varies inversely as x and y = 152 when x = –18, find y when x = 4.
a.
33.78
c.
–684
b.
–33.78
d.
684
 

 4. 
If y varies inversely as x and y = 194 when x = warmups_topic_9_3_files/i0050000.jpg15, find y when x = 5.
a.
582
c.
64.67
b.
–582
d.
–64.67
 

 5. 
Suppose y varies jointly as x and z. Find y when x = 4 and z = 9, if y = 156 when x = 6 and z = 11.
a.
85.09
c.
286
b.
936
d.
9.45
 

 6. 
Suppose y varies jointly as x and z. Find y when x = warmups_topic_9_3_files/i0070000.jpg10 and z = 14, if y = 118 when x = warmups_topic_9_3_files/i0070001.jpg4 and z = warmups_topic_9_3_files/i0070002.jpg9.
a.
warmups_topic_9_3_files/i0070003.jpg30
c.
4,130
b.
warmups_topic_9_3_files/i0070004.jpg459
d.
459
 



 
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