Section 4.5Write Equations of Parallel

and Perpendicular Lines

Graph the following two lines: 1.

2.

Example 1

12

2y x

13

2y x

Write an equation of the line that passes through (-3,3) and is parallel to the line y=-2x+1

Example 2

Geo Sketchpad Activity

Determine the slopes of the lines perpendicular to a line with given slopes:

A. 1/3

B. -10/7

Example 3

Write an equation of a line perpendicular to 2y=3x-6 that passes through the point (3,3).

Example 4

Determine which lines, if any, are parallel or perpendicular

Line a: 2x+6y=-3

Line b: y=3x-8

Line c: -1.5y+4.5x=6

Example 5

HW #43 Parallel and Perpendicular Line Worksheet

Quiz Thursday

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