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4. Let A={(1,3),(2,4),(-4,-8),(3,9),(1,5),(3,6)}. The relation R is defined on A as follows: For all (a, b),(c,...

4. Let A={(1,3),(2,4),(-4,-8),(3,9),(1,5),(3,6)}. The relation R is defined on A as follows: For all (a, b),(c, d) ∈ A, (a, b) R (c, d) ⇔ ad = bc . R is an equivalence relation. Find the distinct equivalence classes of R.

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