Resposta:
[tex]\left \{ {{x+y=15~~eq~I} \atop {x-y=-1~~eq~II}} \right. \\ \\ Na~eq~I\\ \\ x=15-y\\ \\ Na~eq~II\\ \\ x-y=-1\\ \\ 15-y-y=-1\\ \\ -y-y=-1-15\\ \\ -2y=-16~.(-1)\\ \\ 2y=16\\ \\ y=\frac{16}{2} \\ \\ y=8\\ \\ na~eq~I\\ \\ x+y=15\\ \\ x+8=15\\ \\ x=15-8\\ \\ x=7\\ \\ \\ S=\left \{ {{7;~~8} {}} \}[/tex]
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Resposta:
[tex]\left \{ {{x+y=15~~eq~I} \atop {x-y=-1~~eq~II}} \right. \\ \\ Na~eq~I\\ \\ x=15-y\\ \\ Na~eq~II\\ \\ x-y=-1\\ \\ 15-y-y=-1\\ \\ -y-y=-1-15\\ \\ -2y=-16~.(-1)\\ \\ 2y=16\\ \\ y=\frac{16}{2} \\ \\ y=8\\ \\ na~eq~I\\ \\ x+y=15\\ \\ x+8=15\\ \\ x=15-8\\ \\ x=7\\ \\ \\ S=\left \{ {{7;~~8} {}} \}[/tex]