pls show all steps and correct answer, and if possible pls do it handwritten that way i understand it better thanks,  Find the value of the variable a so that the following lines are perpendicular: r1 = (4, -1, -2) + u(2a-1, 3, 4a-1) r2 = (5, 1, -3) + s(8, -2a, -2)

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