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I am confused about how to start with the following problem:

Consider an electrical cable running along the x-axis that is not well insulated from the ground, so that leakage occurs along its entire length. Let V(x,t) and I(x,t) denote the voltage and current at point x in the wire at time t. These functions are related to each other by the system

${V}_{x}=-L{I}_{t}-RI$ and ${I}_{x}=-C{V}_{t}-GV$ where L is the inductance, R is the resistance, C is the capacitance, and G is the leakage to ground. Show that V and I each satisfy:

${u}_{xx}=LC{u}_{tt}+(RC+L){u}_{t}+RGu$.

Thanks,

Cbarker1