1.
If
y
varies directly as
x
and
y
= 21 when
x
= 5, find
x
when
y
= 42.
A.
4.2
B.
5
C.
10
D.
21
Hint
2.
Jim's wages vary directly as the numbers of hours he works. For 7 hours, he makes $38.85. How much will he make in 37 hours?
A.
$1437.45
B.
$194.25
C.
$207.20
D.
$205.35
Hint
3.
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
4.
Use the direct variation equation
to find
x
when
y
= -34.
A.
x
= -
B.
x
= 153
C.
x
= -153
D.
x
=
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.
6 minutes, 40 seconds
B.
18 seconds
C.
18 minutes
D.
9 seconds
Hint