1.
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.
$3.25
C.
$3.28
D.
$3.30
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.
$32.50
B.
$35.75
C.
$33.00
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.
Suppose
y
varies directly with
x
and
y
= 24 when
x
= 8. Write an equation relating
x
and
y
.
A.
y = -3
x
B.
y
= 3
x
C.
D.
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.
$99.95
B.
$99.80
C.
$94.95
D.
$119.94
Hint