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Y = Costo de una Calculadora
Compraron 5 computadores: 5X
Compraron 9 calculadoras: 9Y
5X + 9Y = 17280: Pero X = 3Y
Reemplazo
5(3Y) + 9Y = 17280
15Y + 9Y = 17280
24Y = 17280
Y = 17280/24 = 720
Una Calculadora cuesta S/. 720
Computador = 3(720) = S/. 2160
Rta:
La calculadora cuesta S/. 720
El computador cuesta S/. 2160