Question 1

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

Accepted Answer

c = kn

Answer

k = cn

Answer

c = k/n

Answer

n = k/c

Question 2

The Speed r of a moving object is inversely proportional to the time t traveled in written as

Accepted Answer

k=rt

Answer

t=kr

Answer

r = t/k

Answer

r=kt

Question 3

Which is an example of a direct variation?

Accepted Answer

y = 5x

Answer

2/y = x

Answer

xy = 10

Answer

y = 2/x

Question 4

A car travels a distance of d km n t hours.  The formula that relates d to t is d =kt.  What kind of variation is it?

Accepted Answer

direct

Answer

joint

Answer

combine

Answer

inverse

Question 5

y varies directly as x and y = 32 when x = 4.  Find the constant of variation.

Accepted Answer

8

Answer

36

Answer

128

Answer

28