Explain Linear Functions

Introduction to Linear Functions

Unit 3

Slope Intercept Form

• Follows the format y=mx+b

• Each letter tells us an important feature of the function.

• m is the slope of the line

• b is the y intercept (where the line crosses the y axis)

Positive and Negative Slope

• If a line has a positive slope, it points up to the right side of the graph

• If a line has a negative slope, it points up to the left side of the graph

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Multiple Choice

What is the slope of the line

$$y=-\frac{1}{2}x-4$$  

• $$-\frac{1}{2}$$  

• -4

• y

• x

Multiple Choice

Does the following graph have a positive slope or a negative slope?

• Positive

• Negative

• Neither

Multiple Choice

What is the y intercept of this equation?

$$y=-3x-7$$  

• -3

• -7

• y

• x

Slope on a graph

You can find the slope of a line on a graph by looking at the

 $\frac{rise}{run}$  

Fill in the Blanks

Fill in the Blanks