6. Q(x, y) be the predicate ”If x + y > 0 then xy > 0. ”
(a) Write the statement represented Q(2, −5).
(b) What is the truth value of Q(2, −5)? Justify your answer.
(c) What is the truth value of Q(7, −3)? Justify your answer.
(d) Give values different from the those mentioned above for which Q(x, y) is false.