1.
If
y
varies directly as
x
and
y
= 2 when
x
= 4, find
x
when
y
= 4.
A.
2
B.
8
C.
16
D.
4
Hint
2.
If
y
varies inversely as
x
and
y
= 3 when
x
= 3, find
y
when
x
= 4.
A.
4
B.
3.5
C.
2.25
D.
1
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.
-18
B.
27
C.
2
D.
-3
Hint
4.
Suppose
r
varies jointly with
p
and
q
. If
p
increases and
q
decreases, what will happen to
r
?
A.
It increases.
B.
Cannot be determined from given information.
C.
It decreases.
D.
It stays the same.
Hint
5.
Suppose
x
varies directly with
y
. If
y
increases by a factor of 2, what will happen to
x
?
A.
It will increase by a factor of 2.
B.
It will decrease by a factor of 2.
C.
It will increase by a factor of 4.
D.
It will decrease by a factor of 4.
Hint