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a) [tex]\left\{\begin{matrix} \sqrt{\frac{1-x}{2y+1}}+\sqrt{\frac{2y+1}{1-x}}=2 & \\ x-y=1 & \end{matrix}\right.[/tex]
b)[tex]\left\{\begin{matrix} \left | x-y \right |=\left | 2y-1 \right | & \\ y+1=2x & \end{matrix}\right.[/tex]
b)[tex]\left\{\begin{matrix} \left | x-y \right |=\left | 2y-1 \right | & \\ y+1=2x & \end{matrix}\right.[/tex]