Prealgebra 9.4e - Horizontal and Vertical Lines

[503JAYr]

so all x values are vertical and all y are horizontal?

[derekowens]

@503JAYr Typically the other way around. X is usually horizontal and Y vertical.

[SakaiXYuji]

which way does the line go if its undefined?

[derekowens]

I think you are asking about the slope. The slope of a vertical line is said to be "undefined", so if the slope is "undefined", then it is a vertical line.

Sometimes a vertical line is said to have a slope of infinity, which also makes sense.

If the slope is zero, then it is a horizontal line.

[SakaiXYuji]

thanks