The slope of any vertical Line is undefined because anything divided by zero is undefined.
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A vertical line has neither.
Yes, every non-vertical line can be represented by the equation y = mx + b, where m is the slope of the line and b is the y-intercept. The slope of a line represents the rate of change of the line, while the y-intercept is the point where the line intersects the y-axis. Therefore, every non-vertical line has both a slope and a y-intercept.
A vertical line has a slope of infinity.
A vertical line has an undefined slope. For the line to be parallel to a vertical line, the slopes would have to be the same. Therefore, the line parallel to a vertical line also has an undefined slope.
The slope of a line becomes extremely large in magnitude as the line approaches being vertical;and is undefined or infinite for a truly vertical line.