Question 551139
x=2+y
10x+y=18+10y+x which reduces to 
y=x-2 which is equivalent to x=2+y
so any x (tens digit)  that is 2 more than y (units digit) will work
97=79+18
86=68+18
75=57+18
64=46+18
53=35+18
42=24+18
31=13+18