Plot Graph

Please explain how to make a plot graph

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...is first degree. (if it was x-square we should say that the function is second degree function and graph will be a curve not linear)
-than we need to calculate two reference points to plot this linear graph.
first point; we are going to run this function for x = 0,
y = 3x + 6
y = 3*(0) + 6 (because x = 0)
y = 0 + 6
y = 6
therefore our first reference point is (x=0;y=6) = (0;6)
second point; we are going to run this this function for another any x value, for example we can take x = 2,
y = 3x + 6
y = 3*(2) + 6
y = 6 + 6
y = 12
therefore our second reference point is (x=2;y=12) = (2;12)
now we are ready to plot our function y = 3x +6,
draw the X and Y axes, ...