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If t/u = x/y and and t/y = u/x and t, u, x, y are non-zero integers, which of the following is true?
D) t = +/- u E) None of the above
It's harder to see the question here so it might be helpful to pull it up. I chose E) because t = u OR t = -u. Although in English we refer to +/- u as "plus or minus u" , the expression t = +/- u literally means t = u and t = -u. So, D) states that t is both + and - u, which is incorrect...