Question

Which of the lines below has an undefined slope?

Answer 1

the answer is b because once it's a vertical line it does not have a run for y coordinate

Answer 2

The correct option is B.

Explanation:

The slope of a line is calculated as

`m=(y_2-y_1)/(x_2-x_1)`

The slope of line is undefined if there is no change in the values of x. It is possible only in the case of vertical line.

Graph B represents a vertical line. So the slope of the line in graph B is

`m_B=\infty`

The slope of line B is undefined, therefore the correct option is B.