The graph of the equation [ x = -3 ] is a straight vertical line, passing
through the point [ x = -3 ] on the x-axis. Its slope is infinite.
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The slope of the line defined by the equation x = 3 is infinite.
The slope of f(x) = 3-4x is -4.
That's a vertical line; the slope is not defined.
x = -3 represents a vertical line whose slope is undefined.