Prove that a. the diagonals are perpendicular
b. ABCD has at least one pair of congruent sides
c. ABCD is not a parallelogram

System of two linear inequalities is graphed as shown, where the solution region is shaded. complete the sentences below by determining whether each point is, or is not, located in the solution region. the point (-3,2) located in the solution region. the point (-7,5) located in the solution region. the point (2,-5) located in the solution region. the point (-14,6) located in the solution region.