Introduction to 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 Blank

What is the slope of this line? (write your answer as a fraction using "/")

Fill in the Blank

What is the slope of the line? (write your answer as a fraction using the "/")