Question

a soma das soluçoes do sistema x-y=1 x-3y=-3

Answer 1

$\left \{ {{x-y=1} \atop {x-3y=-3}} \right.$[tex] \left \{ {x-y=1} \atop {x-3y=-3}} \right. [/tex  

x=1+y

x-3y=-3 ----------> (1+y)-3y=-3

                            1-2y=-3

                             -2y=-4

                              y=2

x=1+y ----------->  x=1+2

                            x=3

SOMA DAS SOLUÇÕES= X+Y= 2+3=5