1.
Find the rate of change between two points on a graph that are located at (0.9, 2) and (9.3, 12).
A.
0.84
B.
-1.19
C.
1.19
D.
-0.84
Hint
2.
Suppose
y
varies directly with
x
and
y
= -10 when
x
= 5. Write an equation relating
x
and
y
.
A.
B.
y
= -2
x
C.
D.
y
= 2
x
Hint
3.
Suppose y varies directly with
x
and
y
= 14 when
x
= 3.5. Write an equation relating
x
and
y
.
A.
B.
y
= 4
x
C.
D.
y
= -4
x
Hint
4.
The direct variation equation
y
= .1
x
gives the price
y
for
x
minutes of a long distance calling plan. Use the equation to find the cost for a phone call that is 32.5 minutes long.
A.
$3.28
B.
$3.25
C.
$3.20
D.
$3.30
Hint
5.
The direct variation equation
y
= 19.99
x
gives the total cost
y
of
x
DVDs at a store. Find the total cost of 5 DVDs.
A.
$94.95
B.
$119.94
C.
$99.95
D.
$99.80
Hint