With great difficulty because there is no equality sign and the plus or minus value of 7 is not given.
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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-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.
You can graph an equation or an inequality but you cannot graph an expression.
y=7-3x
7