Can someone please help me?

If the measure of xyz is 81 what is the measure of yz

A, b, c, and d have the coordinates (-8, 1), (-2, 4), (-3, -1), and (-6, 5), respectively. which sentence about the points is true? a. a, b, c, and d lie on the same line. b. and are perpendicular lines. c. and are parallel lines. d. and are intersecting lines but are not perpendicular. e. and are parallel lines.

#1-20 state whether the angles are alternate interior, alternate exterior, vertical, or corresponding angles.