Writing Equations of Parallel and Perpendicular Lines

What is the first step in writing the equation of a parallel or perpendicular line?

• Find the y-intercept of the original line

• Find the midpoint of the original line

• Find the slope of the original line

• Find the x-intercept of the original line

What symbol represents a perpendicular line?

• A right angle

• An upside-down T

• Two parallel lines

• A plus sign

In Example 1, what is the slope of the line perpendicular to the given line?

• -2/3

• 2/3

• -3/2

• 3/2

What is the y-intercept (b) value found in Example 1?

• 0

• 2

• -2

• 3

In Example 2, what is the slope of the line parallel to the given line?

• 2

• 1

• -1

• 0

What is the final equation of the line in Example 2?

• y = -x - 3

• y = x - 3

• y = -x + 3

• y = x + 3

In Example 3, what is the slope of the original line after converting the equation to slope-intercept form?

• -3/2

• 2/3

• -2/3

• 3/2

What is the y-intercept (b) value found in Example 3?

• 7

• 3

• 2

• 5

In Example 4, what is the perpendicular slope to the original line?

• -2

• -1/2

• 2

• 1/2

What is the final equation of the line in Example 4?

• y = 1/2x + 1

• y = -1/2x + 1

• y = 2x + 1

• y = -2x + 1