Algebra-1

The slope  between two points  and  is calculated using the formula .

A line has an undefined slope when the denominator of this formula, , is equal to , which means the -coordinates of the two points are the same.

Let's analyze each pair of points:

A:  and

Here , , , .

The slope .

The slope is  because the -values are the same while the -values change.

B:  and

Here , , , .

The slope

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