{3x+y=13 {x-2y=9 bardzo prosze rozwiazac uklad rownan

[latex] left { {{3x+y=13, ||cdot 2} atop {x-2y=9}} ight. \ left { {6x+2y=26} atop {x-2y=9}} ight. \ (+)----\ 6x+x=26+9\ 7x=35 , ||:7\ x=5\ 5-2y=9\ -2y=4,||:(-2)\ y=-2\ oxed{ left { {{x=5} atop {y=-2}} ight. }[/latex]

{3x+y=13/*2{x-2y=9 6x+2y=26 x-2y=9 + 7x=35/:7 x=5 5-2y=9 -2y=4/:(-2) y=-2