[tex] > resolucao \\ \\ \geqslant metodo \: da \: adicao \\ \\ \\ x + y = 11 \\ x - y = 3 \\ \\ 2x = 14 \\ x = \frac{14}{2} \\ x = 7 \\ \\ y = 11 - x \\ y = 11 - 7 \\ y = 4 \\ \\ \\ s \: = \: ( \: x = 7 \: e \: y = 4 \: ) \\ \\ \\ = = = = = = = = [/tex]
