Question 535993
First Digit = x<P>
Second Digit = y <P>

x+y=14<P>

x=2y-4  (This comes from the relationship explained.)<P>

Substitute the value of x, in terms of y, from the second equation into the first.<P>

2y-4+y=14 ---> 3y=18 (combined y's, added 4 to both sides.)---> y = 6 (divided both sides by 3.)<P>
x+6=14  (subtract 6 from both sides.)  x=8