MATH 9 | ENRICHMENT ACTIVITY #2

If the two quantities are related to each other in a way that changes in one results in a corresponding change of the other is called...

Which of the following is a direct variation?

• y = kxz

• y = kx

• y = k/x

• y = kx/z

Which of the following is an example of Inverse Variation?

• The area of a wall is related to the amount of paint used to cover it.

• The number of tickets sold is related to the amount of money.

• The diameter of a circle is related to its circumference.

• The number of workers is related to the number of days they need to finish a job.

If "y varies directly as x," then what is the constant form of Direct Variation?

• k = y/x

• k = x/y

• k = xy

• none of the choices

If "y varies inversely as x," then what is the constant form of Inverse Variation?

• k = y/x

• k = x/y

• k = xy

• none of the choices

Identify the type of variation shown in the table of value.

• inverse

• joint

• direct

• direct and inverse

Quantity a varies directly as b. If a = 100 when b = 5, what is a if b = 20?

• 20

• 40

• 200

• 400

What is the type of variation and its constant value shown in the given table of values?

• Direct; 200

• Direct; 20, 10, 200

• Inverse; 200

• Inverse; 100, 2, 200

 If "y varies directly as x," then what is the equation of variation?

• y = 180x

• x = 180y

• y = 180/x

• x = 180/y

If "y varies inversely as x," then what is the variation equation of the given table of values?

• x = 45/y

• y = 45/x

• y = 45x

• y = 0.2/x