Răspuns:
[tex]3(x - 1) + 4y = - 8 \\ x = - 2 - y[/tex]
[tex]3( - 2 - y - 1) + 4y = - 8[/tex]
[tex]y = 1[/tex]
[tex]x = - 2 - 1[/tex]
[tex]x = - 3[/tex]
[tex](x.y) = ( - 3.1)[/tex]
[tex]3( - 3 - 1) + 4 \times 1 = - 8 \\ 2( - 3) + 2(1 + 1) = - 2[/tex]
[tex] - 8 = - 8 \\ - 2 = - 2[/tex]
[tex](x.y) = ( - 3.1)[/tex]
