What can be concluded about the graphed polygon? On a coordinate plane, side a has points (negative 2, 4) and (5, 4), side b has points (5, 4) and (5, negative 3), side c has points (5, negative 3) and (negative 4, negative 3), and side d has points (negative 4, negative 3) and (negative 2, 4). Side a is parallel to line b. Side a is parallel to line c. The slopes of sides d and c are reciprocals. The slope of side d is 0.