If the equation of a line has an undefined slope and passes through the point 1 3 which form would be used to write the equation of the line?

Answer 1

x = 1 (the line intersects the x-axis at 1, and is parallel to the y-axis)

We cannot write the equation on the Slope-intercept form, since the slope of the line is undefined. 1 is the x-coordinate of any point on the given line.

Answer 2

If a line has an undefined slope, it means it is a vertical line. The equation of a vertical line passing through the point (1,3) would be written in the form x = 1. This is because all points on a vertical line have the same x-coordinate, which in this case is 1.

Answer 3

Since you are given the slope and a point, you must of course use the point-slope form of the equation.