Homework
NAME____________________________
Cotter
Section 8.4
: # 1, 9, 11, 13, 21, 23, 35, 39, 45, 47, 49, 51, 53
If y varies directly as x, find the constant of variation and the variation equation.
1.
y
= 4
when
x
= 20.
k
= __________________
Equation: _________________________
9.
The weight of a synthetic ball varies directly with the cube of its radius. A ball with a radius
of two inches weighs 1.20 pounds.
Find the weight of a ball of the same material with a 3inch
radius.
weight = _____________________
If y varies inversely as x, find the constant of variation and the variation equation.
13.
y
= 6
when
x
= 5.
k
= __________________
Equation: _________________________
23.
If the voltage in an electrical circuit is held constant, the current
I
is inversely proportional to
the resistance
R
.
If the current is 40 amps when the resistance is 270 ohms, find the current
when the resistance is 150 ohms.
I
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 Spring '11
 JimCotter
 Math, #, 10 feet, 3inch, variation equation

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