2
AssignmentMultiple Choice

Reflections

Question 2 • FL-1205070-M/J Grade 8 Pre-Algebra B

What is the mapping rule for a 180° rotation?

Answer
A
(x, y) → (y, x)
B
(x, y) → (–y, x)
C
(x, y) → (y, –x)
D
(x, y) → (–x, –y)

Explanation

A 180° rotation about the origin sends each point to the point directly opposite it, reversing both coordinates. Thus the rule is (x, y) → (–x, –y), which is choice D.

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