Step 1 To find the equation of a line, we need the slope of the line and a point on the line. Since we are requested to find the equation of the tangent line at the point (16, 4), we know that (16, 4) is a point on the line. So we just need to find its slope. The slope of a tangent line to f(x) at x = a can be found using the formula mtan = lim F(x) - F(a) x-a x-a X In this situation, the function is f(x) = and a = X VO Submit Skip (you cannot come back)