Change independent variable in magnetic field line equations

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SUMMARY

The discussion focuses on transforming a system of magnetic field line equations into a different set of independent variables. The original equations are given as $$\frac{dz}{d\phi} = \frac{rB_z}{B_{\phi}}, \frac{dr}{d\phi} = \frac{rB_r}{B_{\phi}}, \frac{d\phi}{d\phi} = 1$$. Participants emphasize the application of the chain rule to achieve the desired forms $$\frac{dr}{dz}, \frac{d\phi}{dz}, \frac{dz}{dz}$$. The conversion process is straightforward, with the third equation being trivial.

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Jarvis323
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How can I convert this system of equations :

$$\frac{dz}{d\phi} = \frac{rB_z}{B_{\phi}},
\frac{dr}{d\phi} = \frac{rB_r}{B_{\phi}},
\frac{d\phi}{d\phi} = 1$$

to

$$\frac{dr}{dz},
\frac{d\phi}{dz},
\frac{dz}{dz}$$
 
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You can use the chain rule.
Note: the third one is trivial.
 

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