Help me please dont understand

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2