A sketch can be described as the "curve of best fit." In other words, it is necessary to locate enough points to give a reasonably accurate picture of the equation. Of course we could never find all numbers x and y such that x + y = 7, so we must be content with a sketch of the graph. If we represent these answers as ordered pairs (x,y), then we have (5,2) and (3,4) as two points on the plane that represent answers to the equation x + y = 7.Īll possible answers to this equation, located as points on the plane, will give us the graph (or picture) of the equation. Also, if x = 3 then y = 4, since 3 + 4 = 7. For instance, if x = 5 then y - 2, since 5 + 2 = 7. In other words, we will sketch a picture of an equation in two variables.Ĭonsider the equation x + y - 7 and note that we can easily find many solutions. In this section we will discuss the method of graphing an equation in two variables. Graphs are used because a picture usually makes the number facts more easily understood. You can usually find examples of these graphs in the financial section of a newspaper. There are many types of graphs, such as bar graphs, circular graphs, line graphs, and so on.
0 Comments
Leave a Reply. |