1
Section 2.3 – Slope and Intercepts of a Line:
The slope,
m
, of a line that passes through the points
( 29
1
1
,
y
x
A
=
and
( 29
2
2
,
y
x
B
=
is given by
the
slope formula
:
run
rise
x
x
y
y
m
=


=
1
2
1
2
.
1.
What is the slope of the line between points
( 29
3
,
1

=
A
and
( 29
2
,
0
=
B
.
2.
What is the slope of the line between points
( 29
5
,
2

=
A
and
( 29
5
,
1
=
B
.
Positive
Slope
Negative
Slope
Zero Slope
Undefined Slope
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3.
What is the slope of the line between points


=
3
1
,
1
A
and

=
3
2
,
3
B
.
4.
What is the slope of the line between points
( 29
3
,
2

=
A
and
( 29
8
,
2
=
B
.
5.
What is the slope of the line between points
( 29
9
,
4

=
A
and
( 29
0
,
1

=
B
.
The
x
coordinate of the point where a line intersects the
x
axis is called the
x
intercept.
It is
found by setting
y
= 0 in the equation of the line and solving for
x
.
The
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 Spring '08
 Staff
 Slope, Zero Slope

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