Which relationship is always true for the angles r, x, y, and z of triangle abc? x + z = y 180 degrees − x = r x + y + z = 180 degrees x + y + z = 90 degrees

B

Step-by-step explanation:

We can see that angles r and x are both on a line cut by a perpendicular line. This means that the angles on the line should add up to 180.

We can move x to the other side.

linear pair postulates