Which expression is equivalent? 8 − 5(3x − 7)
a) 15x + 43 b) 9x − 21 c) −9x + 21 d) −15x + 43
which expression is equivalent? 6(2x + 3) − 4(5x + 2)
a) 8x + 10 eliminate b) 8x − 10 c) −8x + 10 d) −8x − 10 which is equivalent to the expression? 4(x + 5) + 4x + 8
a) 4(2x + 7) b) 5x + 17 c) 8(x + 4) d) 8x + 13

Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, –6) is rotated 90° counterclockwise. (x, y) → (–y, x) 1. switch the x- and y-coordinates: (6, –3) 2. multiply the new x-coordinate by –1: (6(–1), –3) 3. simplify: (–6, –3) .