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math

posted by on .

are these two lines perpendicular?

x+2y=5
2x+4y=7

How do I determine if these two are perpendicular?

  • math - ,

    it is not perpendicular is this correct?

  • math - ,

    Correct!

    Perpendicular lines have slopes that are negative reciprocals of each other.

    Thus perpendiculars of

    y = -(1/2)x + anything

    will have a form like

    y = 2 + something

    The two lines you specified are in fact parallel, because they have the same slope : (y = -x/2 + something)

  • math - ,

    thanks Jim

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