Article in English: In the section above, we mentioned that derivatives are just formulas that let us find the slope at any point for the equation you take the derivative for. In fact, if you represent an object's displacement with a line on a graph, the slope of the line at any given point is equal to the object's instantaneous velocity at that point.  To graph an object's displacement, use the x axis to represent time and the y axis to represent displacement. Then, just plot points by plugging values for t into your displacement  equation, getting s values for your answers, and marking the t,s (x,y) points on the graph. Note that the graph can extend below the x axis. If the line representing your object's motion drops below the x axis, this represents your object moving behind where it started. Generally, your graph won't extend behind the y axis - we don't often measure velocity for objects moving backward in time! To find a line's slope at a single point P, we use a trick called "taking a limit." Taking a limit involves taking two points (P, plus Q, a point near it) on the curved line and finding the slope of the line linking them over and over again as the distance between P and Q gets smaller. Let's say that our displacement line contains the points (1,3) and (4,7). In this case, if we want to find the slope at (1,3), we can set (1,3) = P and (4,7) = Q. The slope between P and Q is the difference in y-values for P and Q over the difference in x-values for P and Q. In other words, H = (yQ - yP)/(xQ - xP), where H is the slope between the two points. In our example, the slope between P and Q is:H = (yQ - yP)/(xQ - xP)H = (7 - 3)/(4 - 1)H = (4)/(3) = 1.33 Your goal here is to make the distance between P and Q smaller and smaller until it gets close to a single point. The smaller the distance between P and Q gets, the closer the slope of your tiny line segments will be to the slope at point P. Let's do this a few times for our example equation, using the points (2,4.8), (1.5,3.95), and (1.25,3.49) for Q and our original point...

Summary in Indonesian:
Gambarkan grafik perpindahan benda sepanjang waktu. Pilih satu titik P dan Q yang berdekatan di dalam garis. Cari kemiringan di antara P dan Q. Ulangi beberapa kali, gerakkan Q mendekati P. Perkirakan kemiringan garis untuk jarak yang sangat kecil.