Is this linear y=4000-70x if it is how do you know

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.

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

2,10,-50 next two numbers geometric sequence