SUMMATIVE TEST: Variation

The cost (c) of pork varies directly as the number (n) of pens is written as

• C=kn

• k=cn

• n=k/c

• c=k/n

The speed (r) of the car is inversely proportional to the time (t) travelled id written as

• r=kt

• r=k/t

• t=kr

• r/k=t

Which is an example of a direct variation?

• xy=20

• y=2/x

• y=9x

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

• Direct

• Inverse

y varies direct directly as x and y=40 when x=5

What is the constant of variation?

• 45

• 8

• 10

• 40

If y varies inversely as x and y=1/3 when x=8, find y when x=4.

• -2/3

• 2/3

• -32/3

• 32/3

If 3 students can do a task in 8 days, how many students can do the same task in 6 days?

• 7

• 6

• 5

• 4

Which type of variation is illustrated on the given table?

• direct

• inverse

Which of the following equations represents an equation of variation if y varies inversely as the square of x, and y=8 when x=5?

• y=40x²

• y=200/x²

• y=40x

y=3x

• Direct

• Inverse