Would x = 5 be an undefined slope?

1 Answer
Jun 13, 2015

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

Explanation:

If a line passes through points #(x_1, y_1)# and #(x_2, y_2)# 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.