Grade 9 Mathematics Quiz

Which situation below illustrates inverse variation?

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

• The amount of money raised in a concert to the number of tickets sold.

• The time a teacher spends checking test appers to the number of students.

• The age of the used car to its resale value

Which of the following illustrates direct variation?

• The number of hours to finish the job to the number of men working.

• The number of persons sharing a pie to the size of slices of the pie.

• The distance an airplane flies to the time travelling.

• The time spent in walking to the rate at which a person walked.

What type of variation is described by the proportion m=kn?

• direct variation

• inverse variation

• joint variation

• combined variation

Which of the following describes joint variation?

• m=kn

• m= kn

• m=knp

• m=knp

Translate the given data below into mathematical statement.

• y= kx

• y=kx2

• y= kx

• y= kx2

When c varies directly as a and inversely as b, and if the constant of variation k=2, what is the mathematical sentence?

• c = 2ab

• c = 2ab

• a = 2bc

• a = 2bc

Express the mathematical statement d = khr into verbal statement;

• d varies inversely as h and r

• d varies jointly as h and r

• d varies directly as h and r

• d varies directly as h and inversely as r

If x varies inversely as the square of y, what will be its mathematical statement?

• x = ky2

• x =ky2

• y=kx2

• y = kx2

A salesman's commission varies directly as his sales. If his commission is Php80.00 for Php 1,000.00 in sales, what is his commission for Php 2, 750.00 in sales?

• Php200.00

• Php 220.00

• Php 240.00

• Php 260.00

If a varies directly as b and if a= 3 when b= 24, find b when a = 10.

• 36.5

• 40

• 60

• 80