Please help me on this question, I’ll give brainliest just pls help me :( i am struggling.

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

Aclassmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. explain why this isn't true.

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.