The polygon A'B'C'D is a translation of ABCD across the y-axis
a reflection of ABCD across the y-axis
a reflection of ABCD across the x-axis
a translation of ABCD across the x-axis

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.