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Please show all steps, thank you. Question 1 (3 points) Find the value of the variable a so that the following lines are perpendicular: r1

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Please show all steps, thank you.

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Question 1 (3 points) 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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