MATH 9 2nd Quarter

The speed r of a moving object is inversely proportional to the time t traveled is written as ___________.

• r = kt

• r = k/t 

• t = kr

• r/k = r

Which of the following is an example of a direct variation?

• xy = 10

• y = 2/x

• t = kr

• r/k = r

The cost c varies directly as the number n of pencils is written as ____.

• n = kc

• c = kn

• k = kn

• c = k/n

What letter or variable is used to represent the constant of variation?

Which expression is read as “y varies jointly as x and z”?

What happens to T when h is doubled in the equation T = 4h?

• T is halved

• T is doubled

• T is tripled

• T becomes zero

In the equation y = 7x, which is the constant of variation?

Ejay, Joshua, Ralph and Chris can do a portion of a job in 8 days. If the job is to be completed within 6 days, how many workers are needed?

• 1

• 2

• 3

• 4

At 60 kilometers per hour, it takes Kevin 10 hours to travel from his house in the province to Manila. How long will it take him if he travels 80 kilometers per hour?

• 6

• 6.5

• 7

• 7.5

Any number that is raised to the power of zero is equal to ______.

• 0

• 1

• 2

• 3