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Slop between (x1, y1) and (x2, y2) is given by:

slope = y_difference / x_difference

= (y2 - y1) / (x2 - x1)

For (-1, -1) to (3, 15):

slope= (15 - -1) / (3 - -1)

= 16 / 4

=4

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