Warm UpFind the value of m.

1. 2.

3. 4.

2.9B Writing the Equation of the Line

Math Journal 9-261. Find the slope and the y-intercept of each line to write the equation of the line in slope-intercept form.

Given the line equation, find the slope of the parallel line and the perpendicular line.2. // m = m =

3. // m = m =

2.9B Writing the Equation of the Line

ObjectivesGraph lines and write their equations in slope-intercept and point-slope form.

For each equation, identify the slope and y-intercept and then graph the line.

Example 1:

Example 2:

Example 3:

Example 4: Example 5:

Identify the slope and a point for each line. Then graph the line.

Example 6:

Example 7:

Write the equation of the line that passes through the given point and has the given slope.Example 8: Example 9:

(3, 5), m = 2 (-4, 7), m = ½

Write the equation of the line that passes through the two given points.Example 10: Example 11:(-2, -6), (4, 2) (-5, 3), (-3, 6)

Write the equation of the line that passes through the given point and is…

(a)Parallel to the given line and (b) perpendicular to the given line.

Example 12

y = 3x – 5

Parallel line Perpendicular line

m = m =

Example 13

y = 1/2 x + 4

Parallel line Perpendicular line

m = m =