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

label Algebra
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  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?
Apr 29th, 2015

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



Apr 29th, 2015

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