1.
If
y
varies directly as
x
and
y
= 6 when
x
= 2, find
y
when
x
= 5.
A.
B.
6
C.
15
D.
2.4
Hint
2.
If
w
varies directly as
z
and
w
= 9 when
z
= -6, find
w
when
z
= 3.
A.
4.5
B.
0
C.
-2
D.
-4.5
Hint
3.
If
y
varies directly as
x
and
y
= 2 when
x
= 4, find
x
when
y
= 4.
A.
4
B.
16
C.
8
D.
2
Hint
4.
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.
-3
C.
27
D.
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 decreases.
C.
It stays the same.
D.
It increases.
Hint