1.
If
y
varies inversely as
x
and
y
= 12 when
x
= 7, find
x
when
y
= 2.
A.
42
B.
5
C.
7
D.
10
Hint
2.
Suppose
y
varies directly as
x
and
y
= 13 when
x
= 7. Find the constant of variation and write an equation.
A.
k
=
and
y
= 13 · 7
x
B.
k
=
and
y
=
x
C.
k
=
and
y
=
x
D.
k
=
and
y
= 13 · 7
x
Hint
3.
Use
y
=
to find the value of
y
when
x
= 14.
A.
8
B.
28
C.
98
D.
56
Hint
4.
If
y
varies directly as the square root of
x
and
x
= 25 when
y
= -15, find
x
when
y
= -108.
A.
x
= -5
B.
x
= 1500
C.
x
= 6
D.
x
= 4500
Hint
5.
Which best describes this graph?
A.
direct variation
B.
inverse variation
C.
joint variation
D.
none of these
Hint