For the following question, select all the answer choices that ap

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For the following question, select all the answer choices that apply.

Which of the following lines are perpendicular to the line y=x in the xy-plane?

Indicate all such lines.

A、x=0
B、y=-1
C、x+y=0
D、x+y=1
E、x-y=2

答案：C,D

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