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Momo

  • 5 years ago

What is the slope of a line perpendicular to the line 4x - 5y = 8?

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  1. anonymous
    • 5 years ago
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    y = (8 - 4x) / 5 y = 8/5 - (4/5)x y = -(4/5)x + 8/5 the perp. slope is -1 / (-4 / 5) = 5 / 4

  2. momo
    • 5 years ago
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    i was thinking that. so it would be -5/4?

  3. anonymous
    • 5 years ago
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    if M is a slope, then its perpendicular is -1 / M in this case, M = -4/5 so perp. to M is 5 / 4

  4. momo
    • 5 years ago
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    well, that isn't one of my options. my options are 8, -4, 4/5, and -5/4 i was thinking maybe the - would be cancelled out and it would be 4/5

  5. anonymous
    • 5 years ago
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    y = Mx + b y = (4/5)x - (8/5) perp = -1/M = -1/ (4/5) = -5/4

  6. momo
    • 5 years ago
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    awesome! thanks :). my original thought haha

  7. anonymous
    • 5 years ago
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    np (:

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