y = b^x
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Logarithmic equation
The y-axis on a semi logarithmic chart is exponential. This way, when an exponential function is depicted in the chart, it will evolve as a linear function. You often do this to proove that the function is exponential and/or as a tool to help you find the equation for the function. For more see: http://www.answers.com/topic/semi-logarithmic-plot
It is the logarithmic function.
A basic logarithmic equation would be of the form y = a + b*ln(x)
If the equation was ln(x) = 2.35 then x = 10.4856, approx.