Point E with coordinates (5,7) is translated along a glide reflection to its image of E' (-7,9). Which best describes the glide reflection?

Here is their argument. given the obtuse angle x, we make a quadrilateral abcd with ∠dab = x, and ∠abc = 90◦, and ad = bc. say the perpendicular bisector to dc meets the perpendicular bisector to ab at p. then pa = pb and pc = pd. so the triangles pad and pbc have equal sides and are congruent. thus ∠pad = ∠pbc. but pab is isosceles, hence ∠pab = ∠pba. subtracting, gives x = ∠pad−∠pab = ∠pbc −∠pba = 90◦. this is a preposterous conclusion – just where is the mistake in the "proof" and why does the argument break down there?

Which undefined geometric term is described as a location on a coordinate plane that is designed by an ordered pair (x,y) ?

Find the equation of the line with slope =8 and passing through (6,53) write your equation in the form y=mx+b