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. 

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