Technique to solve this equation of 2 unkowns I was solving a problem of single phase eletrical circuits where I had to find the inductor $L$ and resistance $R$. I managed to get two equations containing the two unknowns. $$\frac{R}{R^2+(w*L)^2}=c_1$$ and $$\frac{wL}{R^2+(w*L)^2}=c_2$$ where $w,c_1 \text { and } c_2$ are known.How do I solve this?

Squaring both equations and adding them you get

$$\frac{R^2}{(R^2+(w*L)^2)^2}+\frac{(w*L)^2}{(R^2+(w*L)^2)^2}=c_1^2+c_2^2$$

or

$$\frac{1}{R^2+(w*L)^2}=c_1^2+c_2^2$$

This yields:

$$R^2+(w*L)^2=\frac{1}{c_1^2+c_2^2}$$

Now replace the denominators in both equations.

**Alternate solution**

Dividing the two equations you get

$$\frac{wL}{R}=\frac{c_2}{c_1}$$

Thus

$$wL=\frac{c_2R}{c_1} \,.$$

Replacing in either equation you get an equation in $R$.