The coordinates of the vertices of quadrilateral abcd are a(−4, −1) , b(−1, 2) , c(5, 1) , and d(1, −3) . drag and drop the choices into each box to correctly complete the sentences. the slope of ab ¯ ¯ ¯ ¯ ¯ is , the slope of bc ¯ ¯ ¯ ¯ ¯ is , the slope of cd ¯ ¯ ¯ ¯ ¯ is , and the slope of ad ¯ ¯ ¯ ¯ ¯ is . quadrilateral abcd a parallelogram because . − 2 5 − 1 6 1 3 2 isis notboth pairs of opposite sides are parallelonly one pair of opposite sides is parallelneither pair of opposite sides is parallel