1.
If
y
varies inversely as
x
and
y
= 12 when
x
= 7, find
x
when
y
= 2.
A.
42
B.
7
C.
5
D.
10
Hint
2.
If
y
varies jointly as the square of
x
and the cube of
z
and
y
= 9 when
x
= 3 and
z
= 4, find
y
when
x
= 8 and
z
= 5.
A.
40
B.
100
C.
45
D.
125
Hint
3.
Use
y
=
to find the value of
y
when
x
= 14.
A.
56
B.
28
C.
98
D.
8
Hint
4.
If
y
varies jointly as
x
and the cube root of
z
,
and
y
= 30 when
x
= -5
and
z
= 27, find y when
z
= -8 and
x
= 0.5.
A.
y
= 4
B.
y
= 20
C.
y
= -2
D.
y
= 2
Hint
5.
Which best describes this graph?
A.
direct variation
B.
joint variation
C.
none of these
D.
inverse variation
Hint