Which of the following sets of points are reflections of each other across the y

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glebar ovyyhcf

Mathematics

Description

  1. Which of the following sets of points are reflections of each other across the origin?
    1. Which of the following sets of points are reflections of each other across the y-axis?

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Explanation & Answer

answers are 

Which of the following sets of points are reflections of each other across the origin?

    1.  (4, -7) → (-4, 7)      (third option)

Which of the following sets of points are reflections of each other across the y-axis?

    1.(-6, -9) → (6, -9)         (first option)



when  reflecting at the origin the sign of x and y changes....

that is positive become negative and negative becomes positive...

so  (4, -7) changes to  (-4, 7)  by changing the sign


when  reflecting at the y axis  the sign of x changes  and sign of y remain same

so  (-6, -9) changes to (6, -9)   by changing the sign of x and keeping the sign of  y value same


hope you understood..please message if you have any doubts...thank you




Anonymous
Really useful study material!

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