1.
Consider the equation
y
=
kx
. Which statement is
not
true?
A.
k
is called the direction.
B.
k
is called the constant of variation.
C.
y
is called the dependent variable.
D.
x
is called the independent variable.
Hint
2.
The cost of a container of building staples varies directly as the weight in pounds. Suppose 2 pounds of staples costs $3.60. What is the cost of 5 pounds of staples?
A.
$9.00
B.
$1.40
C.
$5.25
D.
$35.00
Hint
3.
Suppose
y
varies directly as
x
and
y
= 42 when
x
= 3. Find
x
when
y
= 70.
A.
2.5
B.
1.8
C.
5
D.
9.8
Hint
4.
Which is the graph of
y
= -3
x
A.
B.
C.
D.
Hint
5.
Suppose y varies directly as
x
and
y
= -10 when
x
= 5. Find
x
when
y
= 40.
A.
-10
B.
10
C.
20
D.
-20
Hint