Evaluate the expression if a equals two and be equal six

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.

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !