slope-intercept form: y=mx+b

Slope-intercept form: y=mx+b

by: Ms. Macias

y=mx+b

Slope-intercept form is a format we use to write the equation of a line.

each letter represents something different

m = slope

b= y-intercept

y= all the y-coordinate values on the line

x= all the x-coordinate values

Multiple Choice

What does "b" represent in y=mx+b?

• slope

• y-intercept

• all the y-coordinate values on the line

• all the x-coordinate values on the line

Multiple Choice

What does "m" represent in y=mx+b?

• slope

• y-intercept

• all the y-coordinate values on the line

• all the x-coordinate values on the line

Identifying m & b in equations (y=mx+b)

• y= 4x - 3 ..... m= 4 , b= -3

• y = -3x + 7 ..... m= -3 , b= 7

• y = x - 8 ..... m= 1 , b= -8

• y = -x ..... m= -1 , b= 0

• y = 5x + 10 ..... m= 5 , b= 10

Multiple Choice

y = -7x +9

Identify the slope

• m= 9

• m=-7

• m= 7x

• m= -7x

Multiple Choice

y = -7x +9

Identify the y-intercept

• b= 9

• b=-7

• b= 7x

• b= -7x

Multiple Choice

y = -x -10

Identify the m & b

• m= -x , b= -10

• m= -x , b= 10

• m= -1 , b= -10

• m= -1 , b= 10

Slope

• a ratio that describes the steepness of a line

• 4 types of slope - positive, negation, zero, undefined

Multiple Choice

This slope is ...

• negative

• positive

• zero

• undefined

Multiple Choice

This slope is ...

• negative

• positive

• zero

• undefined

Multiple Choice

This slope is ...

• negative

• positive

• zero

• undefined

Finding Slope

• Find two points on the graphed line

• Find the change y over the change in x (rise over run).

Multiple Choice

The slope of the line is...

• 0

• 1

• -1

• - 1/1

Multiple Choice

The slope of the line is...

• 5/4

• -5/4

• -4/5

• 4/5