Direct, Inverse, Jointly

This type of variation states that the two quantities increase at the same time or decrease at the same time.

• Direct Variation

• Inverse Variation

• Joint Variation

• Combined Variation

If y varies directly as x, and y= 8, when x= 2, find y when x=6.

• 24

• 18

• 12

• 6

The cost C of fish varies directly as its weight w in kilogram.

• C =kw

• W=kc

• K= Cw

• K =w/c

if y varies directly as x, and y=30 and x=5. What is the constant of the variation?

• 3

• 6

• 9

• 12

The volume V of a cylinder varies directly as its height h.

• k=Vh

• V=kh

• h=kV

• V=k/h

z varies jointly with x and y. If x = 5, y = -1, and z = 10. Find z when x = -1/2 and y = 7.

• 5

• 6

• 7

• 8

"m varies jointly as n and the square of o", the equation of variation is__________.

• m=kno²

• m=kno³

• m=kno

• m=kn/o

If f varies directly as g and inversely as the square of h, and f = 20 when g = 50 and h = 5, find f when g = 18 and h = 6.

• 4

• 5

• 8

• 10

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

• c = kn

• k = cn

• n = k/c

• c = k/n

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

• r = kt

• r = k/t

• t = kr

• t = r/k