y2x is an expression, which cannot be graphed because we don't know what it equals. y = 2x, y2 = x, and 2y (or y2) = x are all things that could actually be graphed.
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If you mean y = 2x-2 then it is a straight line equation whereas the slope is 2 and the y intercept is -2 and its coordinates would be plotted on the Cartesian plane.
Select a set of values for x from its domain. Calculate the corresponding values of y using one of the given equations. Plot the points on the coordinate plane and join the points. Repeat for the second equation, to give a second line.
If you mean y = 2x then it is a straight line equation
y=2x+4 is in slope intercept form
If all the vertices and edges of a graph A are in graph B then graph A is a sub graph of B.