f of x equals 1 is just a horizontal line. So that right over there is the graph y is equal to f of x, which is equal to 1. Now, remember, the derivative, one way to conceptualize it, is just the slope of the tangent line at any point. So what is the slope of the tangent line at this point? And actually, what's the slope at every point? Well, this is a line, so the slope doesn't change. It has a constant slope, and it's a completely horizontal line.