Without any equality signs the given expressions can't be considered as equations.
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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.
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.
If you mean y = 2x then it is a straight line equation
y=2x+4 is in slope intercept form
The slope of y = 2x - 4 is 2. (y = mx + b, where m is the slope, in this case 2.)