1

2

Graphing Lines ­ 2

"Using the Intercepts Method"

There are 2 Intercepts for any linear equation:

• x-intercept:

• y-intercept:

where line crosses the x­axis

where line crosses the y­axis 

*to find x-intercept from any eq'n, let y = 0, and solve for x.

*to find y-intercept from any eq'n, let x = 0, and solve for y.

3

• Graph 3x ­ 2y = 6

4

• Graph    y = 2x ­ 2

5

• Graph    3x + 4y ­ 12 = 0

6

Graphing Lines ­ 3"Using Slope‐Intercept Form"

y = mx + b  the slope­intercept form of a linear eq'n.

* To graph using this method, we MUST convert equations to slope-intercept form

• Graph  x ­ 2y = 2  using slope­int. method

7

• Graph  3x-y+4=0  using slope­int. method

1 2 3 4 5 6­6 ­5 ­4 ­3 ­2 ­1

1

2

3

4

­1

­2

­3

­4

8

• Graph  y = -1/4 x + 5  using slope­intercept method

1 2 3 4 5 6­6 ­5 ­4 ­3 ­2 ­1

1

2

3

4

­1

­2

­3

­4

9

1 2 3 4 5 6­6 ­5 ­4 ­3 ­2 ­1

1

2

3

4

­1

­2

­3

­4

• Graph and find m and  b  of y = 0

10

Exercise # 11 & 12# 1-12