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
= 14 when
x
= 3.5. Write an equation relating
x
and
y
.
A.
B.
y
= 4
x
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.
$3.20
B.
$3.30
C.
$3.25
D.
$3.28
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.
$32.50
B.
$37.05
C.
$35.75
D.
$33.00
Hint
5.
Suppose
y
varies directly with
x
and
y
= 24 when
x
= 8. Write an equation relating
x
and
y
.
A.
y
= 3
x
B.
C.
y = -3
x
D.
Hint