Would x = 5 be an undefined slope?

1 Answer
Jun 13, 2015

The line described by the equation x=5x=5 has undefined slope.

Explanation:

If a line passes through points (x_1, y_1)(x1,y1) and (x_2, y_2)(x2,y2) then its slope is given by the formula:

m = (Delta y)/(Delta x) = (y_2 - y_1)/(x_2 - x_1)

In the case of the line x=5 choose example points (5, 0) and (5, 1).

Then m = (1 - 0) / (5 - 5) = 1/0 which is undefined.