<PRE><B>Question 550872</B>
Look at the second part first.  xy - 63 = yx.  Look at the possibilities for y-3=x:&lt;P&gt;
y=1 so 1-3=x=-2 or, if a ten had been carried from the tens digit it&#39;s 11-3=8.&lt;P&gt;
Could x=8?  8, carry one ten to the ones digit so that becomes 7-6 = 1.&lt;P&gt;
Yes, if x=8 and y=1 it&#39;s 81-63=18.&lt;P&gt;
Check it in the first part.&lt;P&gt;
xy = 81 = 9 (8+1)=9*9.  Yes!
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