2nd QT_ LongTest 1: Variation

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

• 24

• 18

• 12

• 6

Write an equation

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

If "a is proportional to b" and a = 100 when b = 25. Form an equation of the variation.

• a = 100b

• a=25b

• a=4b

• a=100/25

Write an equation

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

• k=Vh

• V=kh

• h=kV

• V=k/h

• direct variation
• inverse variation
• neither direct nor inverse variation

Tags

CCSS.HSA.CED.A.2

CCSS.HSA.REI.D.10

CCSS.HSF.IF.B.4

CCSS.HSF.IF.C.7

CCSS.HSF.LE.A.1

• direct variation
• inverse variation
• neither direct nor inverse variation

Tags

CCSS.HSF.IF.B.4

CCSS.HSF.IF.C.7

CCSS.HSF.LE.A.2

The number of hours to paint a house varies inversely with the number of painters working. A 2400-square foot house can be painted in 27 hours by 6 painters. How many painters would need to work in order to paint the house in 18 hours?

• 8 painters
• 10 painters
• 9 painters
• 11 painters

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.2

If m varies directly as p, and m = 35 when p = 5, find m when p is 6.

• 42

• 36

• 25

• 49

Tags

CCSS.7.EE.B.4

CCSS.7.RP.A.2

CCSS.7.RP.A.3

If x varies inversely as v, and x = 35 when v = 3, find x when v = 15.

• 7

• 9

• 5

• 21

Tags

CCSS.HSA.CED.A.1

CCSS.HSA.REI.A.1

CCSS.HSA.SSE.A.1