1. 4.4 Parallel and Perpendicular Lines
Objective:Write an equation of the line that passes through a given point parallel or perpendicular to a given line

2. What do we Already Know? Write Equations in Slope-Intercept Form
Write Equations in Point-Slope Form
Find the Slope of a Line

3. What we will Know?
How to write an equation of a line that passes through a given point parallel or perpendicular to a given line.

4. PARALLEL LINES
Do not intersect in the same plane
Have the same slope

5. Write an equation in slope-intercept form for the line that passes through (-3,5) and is parallel to the graph of y=2x-4

7. Write an equation in slope-intercept form for the line that passes through (4,-1) and is parallel to the graph of y=(1/4)x+7

9. Write an equation in slope-intercept form for the line that passes through (0,3) and is parallel to the graph of y= -4x+5

11. Perpendicular Lines Lines that intersect and form right angles
Slopes are opposite reciprocals
Ex. m= 4 then the slope of the line that is perpendicular to m= 4 is –1 4

13. Write an equation in slope-intercept form for the line that passes through (-4,6) and is perpendicular to the graph of 2x+3y=12

14. Write an equation in slope-intercept form for the line that passes through (4,7) and is perpendicular to the graph of y=2x-1 3

15. Write an equation in slope-intercept form for the line that passes through (2,3) and is perpendicular to 2x+3y=4

16. Journal
Page 242 #45
Is a horizontal line perpendicular to a vertical line sometimes, always, or never? Explain your reasoning

17. Determine by graphing whether y=5, x=3 and y=-2x+1 are parallel or perpendicular