1.
If
y
varies directly as
x
and
y
= 21 when
x
= 5, find
x
when
y
= 42.
A.
21
B.
10
C.
5
D.
4.2
Hint
2.
A direct variation equation has (-2, 4) and (
n
, -8) as solutions. Find the missing value.
A.
16
B.
4
C.
1
D.
-2
Hint
3.
Suppose
y
varies directly as
x
, and
y
= -319 when
x
= 29. Write a direct variation equation that relates
x
and
y
.
A.
y
= -11
x
B.
C.
y
= 11
x
D.
Hint
4.
Suppose
y
varies directly as
x
, and
y
= -65 when
x
= -26. Write a direct variation equation that relates
x
and
y
.
A.
B.
C.
D.
Hint
5.
Use the direct variation equation
y
= 22
x
to find
x
when
y
= 88.
A.
B.
x
= -4
C.
x
= 4
D.
Hint