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Parallel and Perpendicular Lines

- http//www.wtamu.edu/academic/anns/mps/math/mathla

b/col_algebra/col_alg_tut28_parpen.htm

Geometric Interpretation of Slope

Line Slope Example

2-1-5

Examples

- Find the slope of the line that passes through

the points (-2, 3) and (4, -1).

Examples

- Find the slope of the line that passes through

the points (7, 4) and (7, -1).

Equations of a Line

6x 5y 45

2-1-4

Given m 3 (-5, 4)

We write y - 4 3(x 5)

y 45

x 10

Writing the equation of a line

You Try

- Write an equation for the line in point/slope

form and slope/intercept form that has slope ½

and passes through (4, 6). - Write you answer in slope intercept form.

Parallel and Perpendicular Lines

Examples

- Find the equation of a line that is parallel to y

2x 3 and passes through the point (4, 3).

Write you answer in slope intercept form.

Examples

- Find the equation of a line that is perpendicular

to y 2x 3 and passes through the point (4,

3). Write you answer in slope intercept form.

Examples

- Find the equation of a line that is parallel to y

½x 9 and passes through the point (3, -1).

Write you answer in slope intercept form.

Examples

- Find the equation of a line that is perpendicular

to y -¼ x 3 and passes through the point (0,

-3). Write you answer in slope intercept form.

Examples

- Find the equation of a line that is parallel to y

(-3/4)x 3 and passes through the point (1,

9). Write you answer in slope intercept form.

Example

- Write the equation of the line that is
- a) parallel to the equation x 4 and passes

through the point (-3, 19). - b) perpendicular to the equation x 4 and passes

through the point (-3, 19).

Assignment

- 3.6-3.7 Worksheet
- Chapter Review
- Chapter 3 Test Friday