Resol V_{1}=frac{VR_{1}}{R_{1}+R_{2}}

$$V _ { 1 } = \frac { V R _ { 1 } } { R _ { 1 } + R _ { 2 } }$$

Resoleu R_1

$$\left\{\begin{matrix}R_{1}=\frac{R_{2}V_{1}}{V-V_{1}}\text{, }&R_{2}\neq 0\text{ and }V\neq 0\text{ and }V_{1}\neq V\\R_{1}\neq 0\text{, }&R_{2}=0\text{ and }V=V_{1}\text{ and }V_{1}\neq 0\\R_{1}\neq -R_{2}\text{, }&V_{1}=0\text{ and }V=0\end{matrix}\right,$$

Resoleu R_2

$$\left\{\begin{matrix}R_{2}=\frac{R_{1}\left(V-V_{1}\right)}{V_{1}}\text{, }&R_{1}\neq 0\text{ and }V\neq 0\text{ and }V_{1}\neq 0\\R_{2}\neq -R_{1}\text{, }&R_{1}\neq 0\text{ and }V_{1}=0\text{ and }V=0\\R_{2}\neq 0\text{, }&V_{1}=0\text{ and }R_{1}=0\end{matrix}\right,$$