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.
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.
$33.00
B.
$32.50
C.
$35.75
D.
$37.05
Hint
3.
Suppose
y
varies directly with
x
and
when
Write an equation relating
x
and
y
.
A.
B.
C.
D.
Hint
4.
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.
$94.95
C.
$99.80
D.
$99.95
Hint
5.
At a gas station, 15 gallons of gas has a price of $17.55 and 18 gallons of gas has a price of $21.06. Write a direct variation equation that relates the cost
y
of any number of gallons of gas
x
.
A.
y
= 1.2
x
B.
y
= 1.17
x
C.
y
= 1.07
x
D.
y
= 1.15
x
Hint