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6 December, 20:28

For every positive 2-digit number, x, with tens digit t and units digit u, let y be the 2-digit number formed by reversing the digits of x. Which of the followingexpressions is equivalent to x - y? a) 9 (t - u) b) 9 (u - t) c) 9t - u d) 9u - t e) 0

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  1. 6 December, 20:51
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    a) 9 (t - u)

    Step-by-step explanation:

    x = 10t + u

    y = 10u + t

    x - y = 10t + u - 10u - t

    = 9t - 9u

    = 9 (t - u)
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