SOLUTION: x+y= 8 x-y= 10
-> -> SOLUTION: x+y= 8 x-y= 10
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X+Y=8 THEN X=8-Y SUBSTITUTING X=8-Y FOR X IN THE SECOND EQUATION WE GET
8-Y-Y=10 OR 8-2Y=10 OR -2Y=2 OR Y=2/-2 OR Y=-1 THEN X=8-(-1) OR X=9
9-1=8 AND 9-(-1)=10 OR 9+1=10.