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The vertices of triangle ABC are a(8,23) B(2,2) C(2,8). What are the coordinates of the vertices if the triangle is reflected across the x-axis?
is it A(8,2) B(2, -2) C(2, -8)?

reflection across the x-axis takes (x,y) --> (x,-y)

So, if (8,23) is supposed to be (8,-2), then you are correct.

i really need your help i am very stupid in math i mean i don't know math and i have 2 homeworks please anyone help me the teacher will kill me tomorrow if i didn't submit my homework!!!!!!!!!!!!!!11 guys i begg u anyone help

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