To graph an equation, first choose some x-values you like. Then, calculate the corresponding y-values using the equation. Now you have several number pairs (ordered pairs) that you can PLOT as POINTS (the x and y values are the x- and y-coordinates of the point).
In this lesson, the equations are LINEAR equations, so we can draw a line through the points to complete the graph. Of course, there also exist other types of equations whose graphs are not straight lines - you will learn about those in algebra I and algebra II courses.
Check out also my other pre-algebra videos at http://www.mathmammoth.com/videos/prealgebra/pre-algebra-videos.php
Tagged under: pre-algebra,graphing,graph equation,equation,linear equation,ordered pairs, , ,plot points,grade 7,math,algebra
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