Visualizing derivatives

For a curved slope, the derivative may be  a straight line that has a gradient.
For a straight line with a gradient,  the derivative is a constant value not equal to 0.


    Visualizing derivatives exercise: Exercise available at https://www.khanacademy.org/math/calculus/differential-calculus/derivative_intro/e/visualizing_derivatives

Exercise made by Stephanie Chang

    Intuitively drawing the derivative of a function: