1.
An equation of the form
xy
=
k
, where
k
0, is called a(n) _____.
A.
proportional variation
B.
inverse variation
C.
inconsistant variation
D.
direct variation
Hint
2.
Which statement is
not
true about an inverse variation?
A.
The constant of variation is
.
B.
In the equation
xy
=
k
,
k
is a constant.
C.
If
y
varies inversely as
x
, then
y
is inversely proportional to
x
.
D.
The product of the variables is constant.
Hint
3.
Suppose
y
varies inversely as
x
and
y
= 4 when
x
= -2. Find
y
when
x
= 1.
A.
-8
B.
-2
C.
D.
Hint
4.
In the formula
d
=
rt
, the time
t
varies inversely as the rate
r
. A racing motorcycle traveling at 96 miles per hour completed one lap around a track in 1.5 minutes. How fast was the motorcycle traveling if it completed the next lap in 1.2 minutes?
A.
120 mph
B.
76 mph
C.
168.5 mph
D.
171.5 mph
Hint
5.
Alice and Gertrude take 8 hours to mow a lawn. If everyone mows the lawn at the same speed as Gertrude and Alice, how long would it take 4 people to mow a lawn?
A.
3 hours
B.
4 hours
C.
6 hours
D.
2 hours
Hint