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x+1=y-1...............x-y= -1-1.................................x-y= -2
2(x-1)=y+1...........2x-2=y+1.........2x-y=1+2.........2x-y=3
hacemos reduccion
-1(x-y= -2).................-x+y=2
2x-y=3......................2x-y=3
x=5
si x=5
2x-y=3
2(5)-y=3
10-y=3
-y=3-10
-y= -7
y=7
pedro tiene 5 dulces y juan tiene 7 dulces