MATH 9 SECOND QUARTER

A relationship where one variable increases as the other decreases.

• Inverse Variation

• Direct Variation

• Joint Variation

• Combined Variation

Which of the following statements best defines direct variation?

• A relationship where the product of two variables is constant.
  
  

• A relationship where one variable increases as the other decreases.
  
  

• A relationship where one variable is inversely proportional to the square of another.

• A relationship where one variable is proportional to another, and their ratio is constant.

Which of the following equations illustrates inverse variation?

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  Which of the following pair of quantities shows direct relation?

•   Amount of electric bill and amount of kilowatt consumed.

• Number of men working and the number of days to finish the job.

• The speed of a car and the time to reach the destination.

• Number of slices of pizza and the number of persons sharing.

Which operation should be used to determine the constant for two inversely proportional quantities?

• multiplication

• division

• addition

• subtraction

Which of the following equations illustrates direct variation?

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1.     The commission C of a salesman varies directly as the amount of his sales. What equation will represent the given situation?

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Which of the following pair of quantities shows inverse relation?

• Number of men working and the number of works done.

• Renting cost and the number of persons sharing.

•  Amount of electric bill and amount of kilowatt consumed.

•   The speed of a car and the distance it travelled.

z varies jointly as x and y can be written as ______.

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If y varies jointly as x and w and inversely as z, which of the following equations is correct?

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