x + y = 5 {\displaystyle x + y = 5}
x − y = 1 {\displaystyle x-y=1}
x , y = x + y ± ( x − y ) 2 = 5 ± 1 2 ⇒ x = 3 , y = 2 {\displaystyle x,y={\frac {x+y\pm (x-y)}{2}}={\frac {5\pm 1}{2}}\Rightarrow x=3,y=2}
ili
2 x = 6 ⇒ x = 3 {\displaystyle 2x=6\Rightarrow x=3} [1]
3 − y = 1 ⇒ y = 2 {\displaystyle 3-y=1\Rightarrow y=2}