If you mean x - 3 = 0, yes, that would be a vertical line. On the other hand, an equation such as y = x - 3 is not.
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x3
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y = x2 is an (approximately) U shaped graph that is entirely above the x axis and is symmetric about the y axis. y = x3 is asymptotically negatively infinite when x is negatively infinite and positively infinite when x is positively infinite. It is symmetric about the line x+y=0.
This depends on what you mean by "X3". If the equation is x3-x, then the graph would increase up to about y=0.385, crossing the x-axis at x=-1, then decrease to y=-0.385, crossing the origin, then begin to increase again, crossing the x-axis at x=1. If you just mean x*3-x, then the answer would be 2x. You just enter the function in as f(x)=x^3-x and it will tell you the graph. For future reference, x3 is x^3, not x3.
a straight line is mainly x2 a curved line is mainly x3