Question

Find the coordinates of the image of point R(3, –5) rotated 180° about the origin. (1 point)
• (–3, 5)
• (–5, –3)
• (5, 3)
• (3, –5)

Answer 1

These problems are much easier using a linear transformation matrix. The matrix for this problem is
[ -1 0;
0 -1]
multiply this matrix by each vector (2x2 matrix times 2x1 vectors)

Answer 2

rule is (x, y) => (-x, -y)