Question

What is the slope of the line that passes through the points (1,

7) and
(1, 13)? Write your answer in simplest form.

Answer 1

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Explanation:

both points have the same x coordinate.

that means the line they are on is the line x = 1.

remember, the slope is (y coordinate change / x coordinate change) when going from one point to another on the line.

but for a line like this, the x coordinate change is always 0 (as every point will always have the x coordinate = 1).

so, the slope is y/0, which is undefined.