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Sagot :
Usemos la variable x para representar el número de tazas e y para el número de llaveros.
Si el número de artículos es 21, tenemos:
[tex]x+y=21[/tex]Si el costo total es 132.5, tenemos:
[tex]8.5x+2.75y=132.5[/tex]De la primera ecuación, podemos escribir:
[tex]y=21-x[/tex]Usando este valor de y en la segunda ecuación:
[tex]\begin{gathered} 8.5x+2.75(21-x)=132.5 \\ 8.5x+57.75-2.75x=132.5 \\ 5.75x=74.75 \\ x=13 \end{gathered}[/tex]Entonces la cantidad de tazas compradas es 13.
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