1.
Consider the equation
y
=
kx
. Which statement is
not
true?
A.
y
is called the dependent variable.
B.
x
is called the independent variable.
C.
k
is called the direction.
D.
k
is called the constant of variation.
Hint
2.
Which equation is a direct variation?
A.
y
= 3 + 8
x
B.
x
+
y
= 1
C.
y
=
x
- 2
D.
y
= -5
x
Hint
3.
Suppose
y
varies directly as
x
and
y
= 42 when
x
= 3. Find
x
when
y
= 70.
A.
9.8
B.
2.5
C.
5
D.
1.8
Hint
4.
Suppose y varies directly as
x
and
y
= -10 when
x
= 5. Find
x
when
y
= 40.
A.
-20
B.
20
C.
-10
D.
10
Hint
5.
If there are 3 feet in 1 yard, how many feet are in 7.8 yards?
A.
14.9 ft
B.
23.4 ft
C.
2.6 ft
D.
2.2 ft
Hint