# Slope Finding the Slope Classifying Lines by Slope, Determining Parallel and Perpendicular Lines - PowerPoint PPT Presentation

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## Slope Finding the Slope Classifying Lines by Slope, Determining Parallel and Perpendicular Lines

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### Slope Finding the Slope Classifying Lines by Slope, Determining Parallel and Perpendicular Lines Created By: CEllis2 December 2nd, 2005 LOOK Here are some important ... – PowerPoint PPT presentation

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Title: Slope Finding the Slope Classifying Lines by Slope, Determining Parallel and Perpendicular Lines

1
Slope Finding the Slope Classifying Lines by
Slope, Determining Parallel and Perpendicular
Lines
• Created By CEllis2
• December 2nd, 2005

2
with Slopes
• The Slope of a nonvertical line is the ratio of
the vertical change (the rise) to the horizontal
change (the run).
• The slope of the nonvertical line passing through
the points (x1 y1) and (x2,y2) is
• m y2 y1 rise
• x2 x1 run
• When calculating the slope of a line, be careful
to subtract the coordinates in the correct order

BRAIN FOOD
rise
run
3
Lets See If You Can Find The Slope After All
Youve Learned
• Find the Slope of the line passing through (-3,
5) and (2, 1)
• Let (x1, y1)(-3, 5) and (x2, y2) (2, 1)
• Chose the Question Mark (?) to the right that
is the correct answer. If you choose the wrong
answer it will send you to the notes page for
more reviewing. GOOD LUCK!!!
• 5/4
• 4/5
• -4/5
• -5/4

4
• Take a look here and Ill explain why.
• m y2- y1
• x2 x1
• 1-5 Substitute Values
• 2-(-3)
• -4 Simplify
• 23
• -4 Simplify
• 5

5
Classifying Lines By Slopes
• A line with a positive slope rises from left to
right (m gt 0)
• A line with a negative slope falls from left to
right (m lt 0)
• A line with a slope of zero is horizontal (m0)
• A line with an undefined slope is vertical (m is
undefined)
• Positive Slope Negative Slope
• Zero Slope Undefined Slope

6
Lets See What Youve Learned
• Without Graphing tell whether the line through
the given points rises, falls, is horizontal, or
is vertical
• a.) (3, -4) (1, -6)
• Falls
• Vertical
• Horizontal
• Rises

7
• m -6 (-4) -2 1 Because mgt 0, the
line rise
• 1-3 -2
• DO YOU UNDERSTAND HOW I GOT THIS ANSWER? IF SO
CLICK THE ARROW FOR SOME MORE PRACTICE PROBLEMS

8
Lets See What Youve Learned
• Without graphing tell whether the line through
the given points rises, falls, is horizontal, or
is vertical
• b.) (2, -1) (2, 5)
• Horizontal
• Falls
• Vertical
• Rises

9
Well It Seems To Me You Have A Hang On
Classifying Lines By Slopes
• Here Are the Steps to Solving the Last Problem
You Did.TAKE A LOOK
• m 5-(-1) 6 Because m is undefined, the
line is vertical
• 2-2 0
• I hope you understand. Now Click the arrow for
some more classifications of lines

10
Classifying Lines By Slopes
• Classify the following line
• Positive Negative Zero
Undefined

11
Classifying Lines By Slopes
• Classify the following line
• Positive Negative Undefined Zero

12
You have successfully completed this tutorial if
you have any other questions that this tutorial