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Math 1300
Section 2.4 Notes
1
Graphing
Lines:
The graph of an equation of the form
B
Ax
y
+
=
is a line.
If A > 0, then the graph will RISE as we move from left to the right.
If A < 0, then the graph will FALL as we move from left to the right.
Below is the graph of
2
3
+

=
x
y
.
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Section 2.4 Notes
2
Example 1:
Graph the line
1
2

=
x
y
.
Fill in the missing x or y values in each row.
x
Y
1
0
1
Math 1300
Section 2.4 Notes
3
Example 2:
Graph the line
2
4
+

=
x
y
.
Fill in the missing x or y values in each row.
x
y
1
0
1
5
4
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Section 2.4 Notes
4
Example 3:
Fill in the table for
8
4

=
x
y
x
y
1
0
1
0
4
Math 1300
Section 2.4 Notes
5
Equations of a Line
Forms of Equations:
1.
The standard form
of a linear equation is given by
C
By
Ax
=
+
where
A
and
B
cannot both be equal to zero.
Example:
5
4
2
=
+
y
x
2.
The pointslope form
of a linear equation is given by
)
(
1
1
x
x
m
y
y

=

where
m is the slope and the line passes through the point (
x
1
,
y
1
).
Example:
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This note was uploaded on 02/21/2012 for the course MATH 1300 taught by Professor Staff during the Spring '08 term at University of Houston.
 Spring '08
 Staff
 Math

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