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x - y = 48
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2x=120
x=60
Entonces:
x+y =72
60+y=72
y=12
2.- (3) 5x + 2y = 24
(-2)4x + 3y = 24
---------------------------------
15x+6y=72
-8x-6y=-48
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7x=24
x=24/7
Entonces :
5(24/7) + 2y=24
120/7 + 2y=24
2y=24-120/7
2y=(168-120)/7
2y=48/7
y=(48/7)/2
y=24/7