Question 251468
the scale on your graph should be determined by the maximum value you expect for the dependent variable and for the independent variable.


if the increments on the x-axis are 1 and you expect the value of x to go from -10 to 10, then your scale on the x-axis is -10 to 10.


the increments on the y-axis are determined by the value of the equation at the extremes of the x-axis.


if the equation is y = 100*x, then when x = -10, y will be equal to -1000, and when x = +10, y will be equal to +1000


your scale on the y-axis should therefore be -1000 to 1000.


you should always add a few units so that the maximum values are not exactly at the edge of the graph.


in the example above, you might set the x-axis from -15 to 15 and the y-axis from -1500 to 1500.


that allows the full measure of the graph to be centered on the graph paper without crowding the edges.


the graph of what I just showed you would look like this:


{{{graph(600,600,-15,15,-1500,1500,100*x)}}}


if  you are manually drawing the graph, you have more control over the units to be displayed.


for example, I would have picked the y-units to be displayed every 100 units.