Slope & Y-intercept

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Slope of a line (m)

The last 2 lines had a positive slope, let’s look at slopes with negative slopes

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Slope of a line (m)

We still use rise over run, except the “stairs” are underneath the line.

3

-2

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Try for yourself

Draw 2 lines with the following slopes on your graph paper.

C) D)

Start anywhere on your coordinate plane.

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Cahsee Standard

3.3 Graph linear functions, noting that the vertical change (change in y-value) per unit of horizontal change (change in x-value) is always the same and know that the ratio (“rise over run”) is called the slope of a graph.

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What do you need to do?

Identify the slope on a graph

First find where the line goes through (intersects the grid lines)

Draw a triangle and calculate the slope

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What do you need to do?

Decide if it’s a negative or positive slope

Trace the triangle on the graph paper

On the CAHSEE you can write on the test!

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What do you need to do?

Use the formula

Rise is negative 1

Run is 2

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Now it’s your turn

Identify the slope on each line.

First make points where the line intersects the grid

Then calculate the slope

If you finish early, then also identify where the line crosses the y-axis.

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Released Question from CAHSEE

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Released Question from CAHSEE