# Solow Growth Model. Steady State. Can someone explain please?

my lecturer is doing a rather poor job explaining what he's written down, so I'm wondering if someone would be able to explain the following graph for me?

This is a part of the Solow-Swann Growth Model lecture for Macroeconomics, and he's talking about the equilibrium that this model predicts, k stands for capital per worker, s is savings rate, z is technology, d is depreciation rate, n is population growth rate. My confusion is with the Y axis. How does an axis represent two equations..?

In your case, the unit of measurement is "units of output", and both $(n+\delta)k$ and $sf(k)$ are measured in it (capital is measured in units of output, in case you wonder).