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90, Prove that if a line L, with slope m, is perpendicular to a line L2 with slope m2, then mim2 = -1. Hint: Refer to the following figure. Show that mi = b and m2 = c. Next, apply the Pythagorean Theorem to triangles OAC, OCB, and OBA to show that 1 = -bc. A(1, b) C(1, 0) B(1, C) NEXT PAGE