Need to display and pull x-intercept from a linear fit
I am taking a certain range of data points around the straight part of my curve, and attempting to extract an x-intercept out of it using a linear fit. I can display an equation for the line but can't seem to do much with it. At the very least, I want to grab that equation, solve for x when y = 0 and then display that number below the graph. What would be the best way to go about pulling this info...