Resposta :

poty
 {x-y= -5 (5) {8x+5y=12 {5x - 5y = - 25
 {8x +5y = 12
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
13x ////////= -13 ---> x = -1

x-y= - 5 ---> -1-y = -5 ---> y = 4

x³ + y³ = (-1)³ + 4³ = -1 + 64 = 63

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