1.
If
y
varies directly as
x
and
y
= 6 when
x
= 2, find
y
when
x
= 5.
A.
15
B.
6
C.
2.4
D.
Hint
2.
If
y
varies inversely as
x
and
y
= 3 when
x
= 3, find
y
when
x
= 4.
A.
3.5
B.
4
C.
1
D.
2.25
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.
2
C.
-18
D.
-3
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.
-6.4
B.
-5
C.
-5.4
D.
-7.2
Hint
5.
Suppose
r
varies jointly with
p
and
q
. If
p
increases and
q
decreases, what will happen to
r
?
A.
Cannot be determined from given information.
B.
It increases.
C.
It decreases.
D.
It stays the same.
Hint