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marird15

  • 3 years ago

How can u tell whether these lines are parallel or perpendicular or neither with out graphing? line 1; through (-1,9) and (-6,-6) line 2; through (-7,-23) and (0,-2)

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  1. RyanL.
    • 3 years ago
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    (-1,9) and (-6,-6) : slope =3 (-7,-23) and (0,-2): slope=3 same slope means lines are parallel

  2. marird15
    • 3 years ago
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    how did you figure that out with out graphing?

  3. hartnn
    • 3 years ago
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    there is a formula to find the slope of line with 2 points given....

  4. radar
    • 3 years ago
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    They calculated the slope of each line using \[\Delta y \over \Delta x\] When the slopes are equal to each other (in this case they were both 3) they are parallel. If they were negative reciprocals like one was 3 and the other -1/3. then they would of been perpendicular.

  5. hartnn
    • 3 years ago
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    for perpendicular,slopes must be negative inverse

  6. RyanL.
    • 3 years ago
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    @radar I used that method....sorry for nothing showing my work.

  7. marird15
    • 3 years ago
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    ohhhh. okay i got it. and its okay @RyanL.

  8. radar
    • 3 years ago
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    @RyanL, good work, I was just trying to assist. I want to explain what a negative reciprocal is, because by the questions being submitted he is going to need to understand that too.

  9. marird15
    • 3 years ago
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    **She

  10. radar
    • 3 years ago
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    One number is a negative reciprocal of another number if their product is -1.

  11. radar
    • 3 years ago
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    Sorry "she".

  12. marird15
    • 3 years ago
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    its alright.. and okay thanks.. again. lol

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