1
MA 15200
Lesson 23
Parts of Sections 2.3 and 2.4
I
Review of Equations of Lines
In the last lesson we found two forms for equations of lines
PointSlope Form:
1
1
(
)
y
y
m x
x
SlopeIntercept Form:
y
mx
b
Any nonvertical line can be written in both of the forms.
PointSlope Form
An equation of a form
1
1
(
)
y
y
m x
x
is an equation for a line in pointslope form.
The value of
m
is the slope of the line and the ordered pair,
1
1
(
,
)
x
y
, is an indicated point
of the line.
SlopeIntercept Form
An equation of the form
y
mx
b
is an equation for a line in slopeintercept form.
The
value of
m
is the slope of the line and
b
or point (0,
b
) is the
y
intercept of the line.
Ex 1:
Write an equation in pointslope form for the line shown.
Convert to slope
intercept form.
2
2
x
y
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2
II
General Form and Standard Forms for of an Equation of a Line
The
General Form of the Equation of a Line is
0
Ax
By
C
, where
A, B,
and
C
are
integers and
A
is positive.
Some textbooks, have
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 Fall '09
 Equations, Slope, Steven

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