SOLUTION: please help me solve this X+Y+Z=22 X+Y=15 3X+Y+Z=37

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Question 284406: please help me solve this X+Y+Z=22
X+Y=15
3X+Y+Z=37
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
X+Y+Z=22
X+Y=15
3X+Y+Z=37
-------------
X+Y+Z=22
X+Y=15
----------- Subtract
z = 7
-------
3X+Y+Z=37
3x+y+7 = 37
3x+y = 30
x +y = 15
----------- Subtract
2x = 15
x = 15/2
y = 15/2
z = 7