a) /3x-4/ +/3y+5/ =0
\(\Rightarrow\hept{\begin{cases}3x-4=0\\3y+5=0\end{cases}}\Rightarrow\hept{\begin{cases}3x=4\\3y=-5\end{cases}\Rightarrow\hept{\begin{cases}x=\frac{4}{3}\\y=\frac{-5}{3}\end{cases}}}\)
b)/x-y/ + / y+9/25 / =0
\(\Rightarrow\hept{\begin{cases}x-y=0\\y+\frac{9}{25}=0\end{cases}}\Rightarrow\hept{\begin{cases}x=y\\y=\frac{-9}{25}\end{cases}\Rightarrow x=y=\frac{-9}{25}}\)
c)/3-2x/ + /4y+ 5/ =0
\(\Rightarrow\hept{\begin{cases}3-2x=0\\4y+5=0\end{cases}\Rightarrow\hept{\begin{cases}2x=3\\4y=-5\end{cases}\Rightarrow}\hept{\begin{cases}x=\frac{3}{2}\\y=\frac{-5}{4}\end{cases}}}\)