Equation can be explained as any Mathematical Expression which contains an equal sign in it and is represented in form of variables and constants. Every equation can be represented in form of graphs. Graph comprises of x - axis and y-axis, if it is a two dimensional graph. Now we will see how to graph an equation. For representing any equation in a graphical manner, firstly we need to find out the coordinates or points which satisfy the equation. These points are represented either on X-axis or Y-axis. Graphing an equation includes plotting of points in a proper manner. While plotting the points on graph we must give proper attention to the coordinates, that is x- coordinates must be placed over x- axis and y- coordinates must be placed over y- axis. Let us take an example. Suppose we want to plot a graph of equation say x - 2y =0.
For plotting any graph, we need to find its x and y- coordinates, thus from above equation we get x = 2y. Now substituting different values of 'y' we will find different values of 'x' at those 'y' points. Substituting value of 'y' as 0, so value of 'x' obtained will also be 0. Putting 'y' equals to 1 we get 'x' as '2' and putting 'y' equals to 3 we get 'x' as 6.
Thus plotting these points that is (0, 0), (2, 1), (6, 3) on graph. We get the following graph:
In this graph the points are plotted in the manner as they occur for particular equation. (0, 0) is a Point which lies on origin. (2, 1) and (6, 3) lies on space that occur between both axes.