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Answer :

3.-

P1 = (-1, 3) P2 = (5, 4)

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

= (4 - 3) / (5 + 1)

= 1/6

4.-

P1 = (-4, 2) P2 = (-1, 9)

slope = (9 - 2) / (-1 + 4)

= 7 / 3