Mathematics 9

Which is an example of a direct variation?

• A. xy=10

• B. y=5x

• C. y=2/x

• D. 2/y=x

Which of the following represents the statement, m varies directly as j?

• j=km

• m=k/j

• k=j/m

• m=kj

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

• r=kt

• t=kr

• r=k/t

• t=r/k

"The number of person n needed to do a job varies inversely as the number of days d to finish the job". What kind of variation is it?

• Direct

• Joint

• Inverse

• Combined

If p varies directly as q and p=18 when q=-6, then k is _________?

• A. -3

• B. 3

• C. -108

• D. 108

Which of the following situations illustrates combined variations?

• A. A varies directly as B and inversely as C

• B. B varies jointly as D and inversely as M

• C. P is directly proportional to Q and inversely proportional to R

• D. All of the above

Which of the following situations illustrates Inverse variations?

• A. A varies directly as B and inversely as C

• B. B varies jointly as D and inversely as M

• C. P is inversely proportional to Q

• D. All of the above

If s is inversely proportional to √t, and s=7 when t=9, find the value of s when t=27.

• 27/5

• 9/5

• 21/5

• 63/5

t varies directly as the square of p and inversely as z and t=12 when p=3 and z=6. Using k as the constant of variation, which of the following is the equation of variation?

• t=kz/p

t varies directly as the square of p and inversely as z and t=12 when p=3 and z=6. What is the value of k?

• A. 8

• B. 6

• C. 12

• D. 24