Respuesta:
1) x+y = 9 o sea x=9-y
2) 10x+20y = 130
10 (9-y)+20y=130
90-10y+20y=130
10y=130-90
Explicación paso a paso:
y= 40/10 = 4 (Billetes de 20)
x= 9 - 4 = 5 (billetes de 10)
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Respuesta:
1) x+y = 9 o sea x=9-y
2) 10x+20y = 130
10 (9-y)+20y=130
90-10y+20y=130
10y=130-90
Explicación paso a paso:
y= 40/10 = 4 (Billetes de 20)
x= 9 - 4 = 5 (billetes de 10)