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For each of the following pairs of points, find the gradients of the lines passing through them.
(a) K(5, -2), L(6, 2)
(b) M(6, 3), N(-6, +2)
(c) P(2, -5), Q(2, 3)
(d) R(1/4,1/3), S(1/3,1/4)
(e) T(0.5, 0.3), U(-0.2, -0.7)