SOLUTION: 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 following expressions is e

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Question 258731: 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 following
expressions is equivalent to x − y ?
a) 9(t − u) b) 9(u − t) c) 9t − u d) 9u − t e) 0

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
+x=10t%2Bu
+y=10u%2Bt
+x-y=10t%2Bu-%2810u%2Bt%29
+x-y=9t-9u=9%28t-u%29
a) is the correct answer
Example:
x=19%2C+t=1%2C+u=9
y=91
x-y=19-91=-72
9%28t-u%29=9%281-9%29=9%28-8%29=-72