Question 802170
The only tough part is in translating into symbols.  The arithmetic steps from there are simple.


x and y, the two numbers.
{{{y=1+2x}}}.__________________  {{{xy=3(x+y)}}}.  


Simplest path appears to be, substitute for y into the second equation, and solve for x.  Use the result to find the value for y.  You will get a quadratic equation when you do the first substitution.  


Do you need further help?