Find the slope of the line that passes through the points (1, 3) and (5, -7).

The slope of any line is the fraction , where is the change in y-coordinate and is the change in x-coordinate.

To find these changes, we take the difference of the corresponding x and y coordinate for the two points. Here, our y-coordinates are -7 and 3, and our x-coordinates are 5 and 1, so our slope is

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