Answer:
Correct choice is A
Step-by-step explanation:
Two vertices of the rectangle have coordinates A(-1, 5) and B(2, 1). If rectangle sides are parallel to the axes, then two remaining vertices have coordinates C(-1,1) and D(2,5) (see attached diagram for details).
Find the length and the width:

Then the length is 1 unit longer than the width.
D I think. Hope this helps.
Answer:
(a)0,2 1,-1 2,-4 3,-7 (b) yes
The attached picture contains the formula for the area of a triangle. It applies to all triangles.