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12 March, 19:19

Suppose your friend says the line y=-2x + 3 is perpendicular to the line x+2y=8. Do you agree? Explain.

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Answers (2)
  1. 12 March, 19:34
    0
    If they are perpendicular then the product of their slope will = - 1

    y = 2x + 3 has slope of 2 (because of the '2x')

    x + 2y = 8

    2y = - x + 8

    y = - 0.5x - 4

    2 * - 0.5 = - 1 so they are perpendicular

    So the friend was right
  2. 12 March, 19:35
    0
    No because if they were perpendicular their slopes would be opposite reciprocals
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