równanie 5x+2y=13 5*11x+2*0,9y=13,5

5x+2y=13 5*11x+2*0,9y=13,5 5x+2y=13 55x+1.8y=13.5 5x=13-2y /5 55x+1.8y=13.5 x=2.6-0.4 55x+1.8y=13.5 x=2.2 55*2.2+1.8y=13.5 x=2.2 121+1.8y=13.5 x=2.2 1.8y=13.5-121 x=2.2 1.8y=-107.5 x=2.2 y=-59.72