Find the general expression for the slope of a line tangent to the curve of y = 3x at the point P (x1 ,f(x, ) ) . Then find the slopes for x = 2 and x = - 3. Sketch the curve and the tangent lines. What is the general expression in terms of x, for the slope of a line tangent to the curve of the function y = 3x at the point P (x1,f(x1 ))? mtan =