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a = b..............5a = 4b
4 5
despejamos a,en la primera ecuacion y la sustituimos en la segunda
a+b=54
a=54-b
5a=4b
5(54-b)=4b
270-5b=4b
-5b-4b= -270
-9b=-270
b= -270/-9
b=30
a+b=54
a+30=54
a=54-30
a=24
respuesta: a=24 b=30
5a=4b
5(54-b)=4b
270-5b=4b
-5b-4b= -270
-9b=-270
b= -270/-9
b=30
a+b=54
a+30=54
a=54-30
a=24