Solve the system of equations by graphing.
x+y = 3
y= 2x - 15

a. (5, –5)

b.
(–10, –5)

c. (1, 2)

d.
(6, –3)

pictures represent a, b , c ,d

If the angle bisectors of a pair of opposite angles of a quadrilateral are the opposite sides of a parallelogram formed by the two angle bisectors and two sides of the quadrilateral, is the quadrilateral always a parallelogram? explain your answer.