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x+y=72
x-y=48
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2x=120
x=60 y=12
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2x+9y=39
5x-y=-20 x (9)
-------------------
2x+9y=39
45x-9y=-180
----------------------
47x=-141
x=-3 y=5
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8x-3y=24 x(4)
7x-4y=8 x(-3)
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32x-12y=96
-21x+12y=-24
-------------------------
11x=72
x=72/11 y=104/11