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 Interactive Checkpoint
 Direct Proportion (Direct Variation):  The relation between two quantities whose ratio remains constant.

 
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Graded Response

1) You want to buy your mother an 18K gold necklace for her birthday. The cost of the necklace is determined by length of the necklace. It costs $8.50 per inch. You buy the necklace for $102.00. What is the constant of variation?

 

1)
 
 2) In the following table, does one variable directly vary with the other?
 A  B
 5  16
 6  19
 7  22
 10  31

 

2)
 
 3) True or False: The circumference of a circle varies directly as the diameter

 

3)