Question 393186
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Hi
2x + 3y = 12
2x - y = 4 
SOLVING: first for y by elimination (subtracting 2nd equation from 1st)
2x + 3y = 12
-2x + y = -4 
     4y = 8   y = 2
2x - y = 4
  2x -2 = 4
     2x = 6   x = 3
 x + y = 5

Note: it is typical for certain types of testing to take solving
for x and y which is what is usually done by various methods.... to another level 
and ask for the answer in terms of the sum as is done in this example.