Universe: Non-zero integers. Determine truth value of:
a) \exists x\ \exists y\ (xy = 1)
b) \exists x\ \forall y\ (xy = 1)
c) \forall x\ \exists y\ (xy = 1)
d) \exists x\ \exists y\ ((2x + y = 5) \land (x - 3y = -8))
e) \exists x\ \exists y\ ((3x - y = 7) \land (2x + 4y = 3))
Answer:-
