I belive it is A 6,9 but i am not entirely sure.
Basically your negatives beside each other turn into a positive because two negatives equals a positive
<span>A plane is a flat surface that extends infinitely in all directions; thus, a lot of points can be found on a given plane. The plane can be named by taking any three points on it, in no specific order, as long as these points are not on a straight line. An example is plane ABC, given that points A, B and C are found on the plane and are not collinear.</span>