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Direct and Inverse Variation

Multiple Choice

Is the given table a direct or inverse variation? What is the constant of variation?

• Direct. k = 12

• Inverse. k = 12

• Direct. k = 1/12

• Inverse. k = 1/12

Multiple Choice

Is the given table a direct variation? If so, what is the constant of variation?

• Yes. k = 1/3

• Yes. k = 3

• Yes. k = 5

• No

Multiple Choice

Does x and y have a direct relationship?

• yes, because for every x there is a y

• yes, there is a common ratio of y to x which is 4

• no, the differences between x and y are not the same.

• it can not be determined.

Multiple Choice

Which of the given graphs is a direct variation?

• A

• B

• C

• D

Multiple Choice

Given y = 1.1x as the model for the maltese dogs example, about how long is a 10 year old maltese if he was 30 cm at 1 yr old?

• approximately 11.1 cm.

• approximately 44 cm

• approximately 33 cm.

• cannot be determined.

Multiple Choice

What is the formula for finding the constant of variation k for direct variation?

• k = xy

• $$k\ =\ \frac{y}{x}$$