Vertical and Horizontal Lines

Front

What is the equation of a vertical line?

Back

The equation of a vertical line is of the form x = a, where 'a' is a constant.

Front

What is the equation of a horizontal line?

Back

The equation of a horizontal line is of the form y = b, where 'b' is a constant.

Front

What does it mean if a line has an undefined slope?

Back

A line with an undefined slope is vertical and does not change in the x-direction.

Front

What does it mean if a line has a slope of zero?

Back

A line with a slope of zero is horizontal and does not change in the y-direction.

Front

How do you identify a vertical line on a graph?

Back

A vertical line runs parallel to the y-axis and has the same x-coordinate for all points.

Front

How do you identify a horizontal line on a graph?

Back

A horizontal line runs parallel to the x-axis and has the same y-coordinate for all points.

Front

What is the slope of a vertical line?

Back

The slope of a vertical line is undefined.

Front

What is the slope of a horizontal line?

Back

The slope of a horizontal line is zero.

Front

If a line passes through the point (3, 5) and is vertical, what is its equation?

Back

x = 3.

Front

If a line passes through the point (4, -1) and is horizontal, what is its equation?

Back

y = -1.