Find the slope of

a) (−7, 1.3) and (−7, 14.2)
b) (−3, 7.2) and (2, −2.3)

For this case we have that by definition, the slope of a line is given by:

Where:

and are two points through which the line passes.

Slope 1:

Substituting:

It is noted that the slope is undefined.

Slope 2:

Slope 1: Indefinite

Slope 2: -1.9

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