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k constante de proporcionalidad
4k+3k=91
7k=91
k=91/7
k=13
los numeros:
4k........4(13)=52
3k........3(13)=39
los numeros son 52 y 39
ejercicio # 2
7k-4k=120
3k=120
k=120/3
k=40
los vehiculos pesan:
7k.............7(40)=280
4k.............4(40)=160
pesan 280 kg y 160 kg