1.
Consider the equation
y
=
kx
. Which statement is
not
true?
A.
y
is called the dependent variable.
B.
k
is called the direction.
C.
k
is called the constant of variation.
D.
x
is called the independent variable.
Hint
2.
Which equation is a direct variation?
A.
y
= -5
x
B.
y
= 3 + 8
x
C.
x
+
y
= 1
D.
y
=
x
- 2
Hint
3.
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.
$35.00
C.
$5.25
D.
$1.40
Hint
4.
Suppose y varies directly as
x
and
y
= -10 when
x
= 5. Find
x
when
y
= 40.
A.
-20
B.
-10
C.
10
D.
20
Hint
5.
If there are 3 feet in 1 yard, how many feet are in 7.8 yards?
A.
2.2 ft
B.
14.9 ft
C.
2.6 ft
D.
23.4 ft
Hint