Equations of Horizontal and Vertical Lines

What is the equation of a vertical line?

• y = mx + b

• x = a constant

• x = my + b

• y = a constant

Which of the following points lies on the vertical line x = -2?

• (4, -2)

• (-2, 4)

• (0, -2)

• (-2, -4)

What is the equation of a horizontal line?

• x = a constant

• x = my + b

• y = mx + b

• y = a constant

Which of the following points lies on the horizontal line y = -4?

• (-4, 4)

• (0, -4)

• (-4, 0)

• (4, -4)

What is the equation of the vertical line that crosses the x-axis at 1?

• x = 1

• x = -1

• y = -1

• y = 1

What is the equation of the horizontal line that crosses the y-axis at 2?

• y = 2

• x = -2

• y = -2

• x = 2

What is the equation of the vertical line that crosses the x-axis at -4?

• y = 4

• x = -4

• y = -4

• x = 4

How would you graph the equation y = -3?

• As a horizontal line through y = -3

• As a vertical line through y = -3

• As a vertical line through x = -3

• As a horizontal line through x = -3

What is the equation of the y-axis?

• y = x

• x = 0

• y = 0

• x = y

How would you graph the equation y = 4?

• As a horizontal line through x = 4

• As a vertical line through x = 4

• As a vertical line through y = 4

• As a horizontal line through y = 4