SOLUTION: solve by substitution x+y=-9 x-y=14

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Question 45815: solve by substitution
x+y=-9
x-y=14
Answer by checkley71(8403) About Me  (Show Source):
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X+Y=-9 OR X=-9-Y THEN -9-Y-Y=14 OR -9-2Y=14 OR -2Y=14+9 OR -2Y=23 Y=23/-2 OR Y=-11.5 THEN
X-11.5=-9 OR X=-9+11.5 OR X=2.5