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xy=234
x=y+5
sustituimos x=y+5 en la primera ecuacion
xy=234
(y+5)y=234
y²+5y=234
y²+5y-234=0
(y+18)(y-13)=0
y+18=0 y-13=0
y= -18 y=13
siendo medidas de longitud,tomamos el valor positivo
y=13
x=y+5
x=13+5
x=18
x=18 y=13
el largo mide 18 m
el ancho mide 13 m
Espero que te sirva, salu2!!!!