1.
Find the rate of change between two points on a graph that are located at (0.9, 2) and (9.3, 12).
A.
-1.19
B.
1.19
C.
-0.84
D.
0.84
Hint
2.
Suppose y varies directly with
x
and
y
= 14 when
x
= 3.5. Write an equation relating
x
and
y
.
A.
y
= -4
x
B.
C.
D.
y
= 4
x
Hint
3.
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.
$3.20
C.
$3.25
D.
$3.30
Hint
4.
The direct variation equation
y
= 2.75
x
relates miles
x
and the cost
y
for a ride from a taxi company. Use the equation to find the cost of a taxi ride that is 13 miles long.
A.
$37.05
B.
$35.75
C.
$33.00
D.
$32.50
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.
$119.94
B.
$99.80
C.
$99.95
D.
$94.95
Hint