slope finding

AL14.4.notebook

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October 14, 2010

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It rises from left to right It falls from left to right

It's a horizontal lineIt's a vertical line

Classifying Slope: The four major types are,

AL14.4.notebook

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October 14, 2010

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Negative Slope:

Positive Slope:

Slope of a horizontal line

Slope of a vertical line

ZeroUndefined

It falls

It rises

L1

L2

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October 14, 2010

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1. 2. 3.

AL14.4.notebook

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October 14, 2010

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Positive, negative, zero or undefined?

4. 5. 6.

AL14.4.notebook

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October 14, 2010

Oct 26­11:47 AM

vertical line

stays constant

it falls

it rises

Classification of Lines by Slope:

Positive Slope:

Negative Slope:

Zero Slope:

Undefined Slope:   (no slope)

AL14.4.notebook

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October 14, 2010

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When you have the line already graphed, count the "rise over run"

When you don't have a graph, but 2 points instead, use the "Slope Formula"But it really doesn't matter whether you do it graphically or algebraically because it is still the same slope either

way

There are two methods you can use to find the slope of a line: Algebraically or Graphically

AL14.4.notebook

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October 14, 2010

Oct 13­1:16 PM

Algebraically or Graphically ?????????

(3, 4) (-5, 0)

Find the slope of the line that passes through the points:

Algebraically(use the formula)

AL14.4.notebook

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October 14, 2010

Oct 13­1:16 PM

Algebraically or Graphically ?????????

Find the slope of the line:

Graphically(count the rise over run)

AL14.4.notebook

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October 14, 2010

Oct 25­12:10 PM

Use both methods: Algebraically

Finding the rate of change is the same as finding the slope:

AL14.4.notebook

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October 14, 2010

Oct 25­12:10 PM

Use both methods

Finding the rate of change is the same as finding the slope: