Question

Identify the matrix transformation of ΔRST, which has coordinates R(−1, 1),S(2, −2), and T(−3, 3), for 90° rotation, clockwise. Then identify the correct vertices of the image.

Answer 1

( 0 1 ) ( -1 2 -3) (1 -2 3)

= R' (1, 1), S' (-2, -2), T' (3, 3)

( -1 0 ) ( 1 -2 3) (1 -2 3)

Explanation:

Write the x - coordinates of RST in row 1 and the y - coordinates in row 2 of the matrix.

(-1 2 -3)

(1 -2 3)

R S T

For a 90° rotation, clockwise, multiply the matrix by (0 1)

(-1 0)

Then you get your answer.