how do I find this time constant tau from a graph of an RC c

how do I find this time constant, tau, from a graph of an RC circuit. I gave it a line of best fit which came out to be y=0.0434ln(x)+0.3252. My R value is about 100 kOhms and my C value is about 0.01 microFarrads if that helps to know

Solution

Time constant for the RC circuit is RC.

Here R=100*10^3 ohms

C=0.01*10^-6 farads

R*C=100*10^3*0.01*10^-6=0.001.