2Y = - 1 - 5X Y = 0,5*(-5X - 1)= - 2.5X - 0.5 ///////////// - 12 X - 3*(- 2.5X - 0.5) = - 8 - 12X + 7.5X + 1.5 = - 8 - 4.5X = - 9.5 X = 2.1 //////////////// Y = - 5.25 - 0.5 = - 5.75