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Y = 7X - 2
This is a function and, generally, function values are Y values. So, make a table from values put into the X variable.
X = 0
-----------
Y = 7(0) - 2
Y = - 2
----------------
X = 1
----------
Y = 7(1) - 2
Y = 5
----------
X = 2
----------
Y = 7(2) - 2
Y = 12
----------------and so on until enough points are generated to plot your graph