Skyriai
\begin{cases}x+y=1\\x-y=9\end{cases}
\begin{cases}x+y=1\\x-y=9\end{cases}
x^2-9=0\\X_1=3;X_2=-3
x^2-5x+6=0\\X_1=2;X_2=3
\frac{1}{2}x+\frac{2}{3}
sin^2x+cos^2x=1
\text{HEYHEYEHEY}
f(x)=4x-3
f(x)=x^2-4x+4
\begin{cases}x+y>1\\x-y<9\end{cases}
\text{HEYHEYHEYHEY}