Question

Which are the coordinates of the vertices of the reflected figure when triangle DEF is reflected across the y-axis?
http://static.k12.com/calms_media/media/802500_803000/802650/2/574aec4b20e650818569f5a471d2e7d0b0f573ee/14_2140_3_question.jpg

Answer 1

A.


D'(3, 0)

E'(3, –1)

F'(–3, –2)


B.


D'(0, 3)

E'(3, 1)

F'(–3, –2)


C.


D'(0, 3)

E'(3, –1)

F'(–3, –2)


D.


D'(0, –3)

E'(–3, 1)

F'(–3, –2)

Answer 2

@jim_thompson5910
@mathmate

Answer 3

Reflecting about the y-axis has the rule:
\(\large s_y:(x,y) -> (-x, y)\)
So apply the rule to all three points to get the reflected image.

Example, \(s_y (4,2)=(-4,2)\)

Answer 4

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