Explicación paso a paso:
[tex]x + y = 13.5[/tex]
[tex]2x + y = 19[/tex]
Resolviendo el sistema:
[tex]x = 13.5 - y[/tex]
[tex]2(13.5 - y) + y = 19[/tex]
[tex]27 - 2y + y = 19[/tex]
[tex]y = 8[/tex]
[tex]x = 4[/tex]
Siendo x= lapiz
y=lapicero
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Explicación paso a paso:
[tex]x + y = 13.5[/tex]
[tex]2x + y = 19[/tex]
Resolviendo el sistema:
[tex]x = 13.5 - y[/tex]
[tex]2(13.5 - y) + y = 19[/tex]
[tex]27 - 2y + y = 19[/tex]
[tex]y = 8[/tex]
[tex]x = 4[/tex]
Siendo x= lapiz
y=lapicero