1.
Find the rate of change between two points on a graph that are located at (4, 3.2) and (6, 5.9).
A.
-1.35
B.
0.74
C.
1.35
D.
-0.74
Hint
2.
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
3.
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
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.
C.
y = -3
x
D.
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
= 1.07
x
B.
y
= 1.17
x
C.
y
= 1.2
x
D.
y
= 1.15
x
Hint