The first column have some values for the independent variable x. The values for x ranges from -25 to 25. This was chosen at random. The scale is set to 5, so all the important points of the graph would be shown.
These x values were plug into the function y1 and the results are shown in the second column. The y-values first decrease as x-values increase from negative numbers to zero. (0,0) is the vertex and it's also the minimum of the graph. Then, the y-values increase as x increase from 0 to positive values.
The y-values for y2=7x^3 are shown in the third column of table 1. The y-values decreases but only until x=0. Then after that x is 0 the graph increases.
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