Vertical and Horizontal Lines

What is the slope of the line that passes through the point (-1, 2) and is perpendicular to the x-axis?

Undefined

What is the slope of the line that passes through the point (-1, 2) and is perpendicular to the y-axis?

Zero

Zero Slope

the slope of a horizontal line

Undefined slope

the slope of a vertical line

Equations of vertical lines

x = #

What is the equation of the line that passes through the point (-1, 2) and is perpendicular to the x-axis?

x = -1

What is the equation of the line that passes through the point (4, -3) and has a undefined slope?

x = 4

Equations of horizontal lines

y = #

What is the equation of the line that passes through the point (-3, 4) and has a slope of zero?

y = 4

What is the equation of the line that passes through the point (-1, 2) and is perpendicular to the y-axis?

y = 5