[tex]\left \{ {{x+5y=5} \atop {3x-5y=3}} \right.[/tex]
[tex]x=5-5y[/tex]
[tex]3(5-5y)-5y=3\\[/tex]
[tex]15-15y-5y=3[/tex]
[tex]15-20y=3[/tex]
[tex]-20y=12[/tex]
[tex]y=\frac{12}{20}[/tex]
[tex]y=\frac{3}{5}[/tex]
[tex]x=5-5*\frac{3}{5}[/tex]
[tex]x=5-3[/tex]
[tex]x=2[/tex]
[tex]2+5(\frac{3}{5} )=5[/tex]
[tex]2+3=5[/tex]
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[tex]\left \{ {{x+5y=5} \atop {3x-5y=3}} \right.[/tex]
[tex]x=5-5y[/tex]
[tex]3(5-5y)-5y=3\\[/tex]
[tex]15-15y-5y=3[/tex]
[tex]15-20y=3[/tex]
[tex]-20y=12[/tex]
[tex]y=\frac{12}{20}[/tex]
[tex]y=\frac{3}{5}[/tex]
[tex]x=5-5*\frac{3}{5}[/tex]
[tex]x=5-3[/tex]
[tex]x=2[/tex]
Comprobación:
[tex]2+5(\frac{3}{5} )=5[/tex]
[tex]2+3=5[/tex]