Question

DEF with vertices D(2, 5), E(6, 4), and F(3, 3), is reflected across the line y=x

Answer 1

The student's answer is wrong. When a point (a, b) is reflected across the line y=x, the coordinates of the new point is reversed to (b, a). So D(2, 5) would become (5, 2), E(6, 4) would become (4, 6), and F(3, 3) is still (3, 3). None of the new points is (2, -5).