For 9 and 9a, find the slope of the line

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.

Question 1:

According to the image, we have the following points:

Substituting we have:

Thus, the slope is:

Question 2:

According to the image, the line goes through the following points:

Substituting we have:

Thus, the slope is:

Slope 1:

Slope 2:

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