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cassidyohrt

  • 3 years ago

Find the coordinates of the point (-5,7) when it is reflected across the line y=11.

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  1. punnus
    • 3 years ago
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    Use mid point formula.

  2. cassidyohrt
    • 3 years ago
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    But don't you need more than one coordinate?

  3. punnus
    • 3 years ago
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    mirror being mid point of the line joining the two points. \[\left\{ -5,11 \right\}\] now \[-5=\frac{x2-x1 }{ 2 }\] and \[11=\frac{ y2-y1 }{ 2 }\]

  4. punnus
    • 3 years ago
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    you know x1 and y1 find x2 and y2

  5. punnus
    • 3 years ago
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    Did you get it .

  6. cassidyohrt
    • 3 years ago
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    I completely understand what you're saying, but I honestly have no idea how to solve for x2 and y2. I remember learning this, but I haven't used it in 2 years.

  7. punnus
    • 3 years ago
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    did you get the idea behind mid point

  8. cassidyohrt
    • 3 years ago
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    Yes I do!

  9. punnus
    • 3 years ago
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    Then take the given point as the first point in the case i.e (-5,7)

  10. punnus
    • 3 years ago
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    now use x1=-5 and y1=7

  11. punnus
    • 3 years ago
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    now use the formula that I have already posted

  12. cassidyohrt
    • 3 years ago
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    Wait, so wouldn't it be (-5,-7)?

  13. cassidyohrt
    • 3 years ago
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    Nevermind, let me resolve quick.

  14. punnus
    • 3 years ago
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    did you get is answer as (-5,15). If not I can give us an another approach

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