1.
If
y
varies directly as
x
and
y
= 21 when
x
= 5, find
x
when
y
= 42.
A.
10
B.
4.2
C.
21
D.
5
Hint
2.
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
3.
Use the direct variation equation
y
= 22
x
to find
x
when
y
= 88.
A.
B.
C.
x
= 4
D.
x
= -4
Hint
4.
Use the direct variation equation
to find
x
when
y
= -34.
A.
x
= -
B.
x
=
C.
x
= -153
D.
x
= 153
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 minutes
B.
6 minutes, 40 seconds
C.
9 seconds
D.
18 seconds
Hint