>>14263298Let a, b, c, d be integers, b != 0 & d != 0. Rule of cross multiplication states, that a/b = c/d if and only if ad = bc.
Suppose that 96/69 = 1.
1 = 1/1
We see that if 96/69 = 1 then 96 = 69. That is impossible. So 96/69 aren't equal to 1.
Instead, suppose that 9*6/6*9 = 1.
9*6 = 54
By cross multiplication, 54 = 54, which is true. Vise versa, it's easy to prove that
54/54 = 1/1, which is obvious considering the rule.
