1.
If
y
varies directly as
x
and
y
= 21 when
x
= 5, find
x
when
y
= 42.
A.
10
B.
21
C.
4.2
D.
5
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.
D.
y
= -11
x
Hint
4.
Graph
A.
B.
C.
D.
Hint
5.
If Dale Jarrett drives his car 1760 feet on the racetrack in 6 seconds, about how long will it take him to drive 2640 feet, a half mile?
A.
18 seconds
B.
6 minutes, 40 seconds
C.
9 seconds
D.
18 minutes
Hint