What value should replace the "? " to make the equations parallel? type your answer as a reduced fraction, using the" /" symbol to separate the numerator and denominator, like this : 2/5y=5/3x -8y= ? x+9

With math question will mark brainliest question in the pic.

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.

It says factor each expression 49x-28?