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Because in a vertical line the slope is undefined, there is no "y" answer or "b" value and the line is in the form of x = some number such as x = 3 which is a vertical line.
If you mean: y = mx+b then it is the formula for a straight line equation whereas m is the slope and b is the y intercept
If you mean: y = mx+b then m is the slope and b is the y intercept.
In the equation Y=mx+b, which is what I believe you mean, 'b' is the y intercept of the graph. In other words, if the equation is plotted in standard Cartesian coordinates, the straight line crosses the y-axis at the height b above the x axis.
If the equation of a line is in the form ax + by + c = 0 then the slope of the line will be -a/b.