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.
-0.84
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.
y
= -2
x
B.
C.
D.
y
= 2
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.
$3.30
B.
$3.25
C.
$3.20
D.
$3.28
Hint
4.
Suppose
y
varies directly with
x
and
when
Write an equation relating
x
and
y
.
A.
B.
C.
D.
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.
y
= 3
x
C.
D.
Hint