Question 1142798
<br>
Guess and check can be a good way to solve a problem like this if you haven't yet studied algebra.<br>
Guess and check can provide good exercise in logical reasoning if you don't just do random guessing.  It might look something like this....<br><pre>
   x    y = 2x+4   x+y  
  ---------------------------------------------
  10      24       34   too small; make x larger
  20      44       64   still too small
  30      64       94   too big; make x smaller
  ...</pre>
You can continue from there to find the solution.