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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
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