1.
If
y
varies directly as
x
and
y
= 6 when
x
= 2, find
y
when
x
= 5.
A.
B.
6
C.
2.4
D.
15
Hint
2.
If
p
varies inversely as
q
and
p
= -8 when
q
= 2, find
p
when
q
= -4.
A.
4
B.
16
C.
-16
D.
-4
Hint
3.
If
y
varies jointly as
x
and
z
and
y
= 12 when
x
= 2 and
z
= 3, find
y
when
x
= - 3 and
z
= 0.5.
A.
27
B.
-3
C.
2
D.
-18
Hint
4.
Suppose
p
varies jointly as
r
and
t
. If
p
= 1 when
r
= -5 and
t
= 2, find
t
when
p
= 6 and
r
= 12.
A.
-7.2
B.
-5.4
C.
-5
D.
-6.4
Hint
5.
Suppose
x
varies directly with
y
. If
y
increases by a factor of 2, what will happen to
x
?
A.
It will decrease by a factor of 4.
B.
It will increase by a factor of 2.
C.
It will decrease by a factor of 2.
D.
It will increase by a factor of 4.
Hint