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I think you are trying to use the equation y = mx +b, but that form is useful only when m is a number. If the slope is infinite, or "undefined", the line is a vertical line on the graph and its equation is x = c (constant) If the line passes through some given point (x0,y0), then the equation of the line is x = x0 .

There no Y-intercept unless x0 = 0 so the equation of the line is x = 0 , In this special case the graph is exactly the Y-axis so, in a way, every point on it is a Y-intercept or a value for b.

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Q: How do you find b when given an undefined slope and point?
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what- Find the slope of the given line, or write undefined.?

1


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To find the slope (steepness, not height) of a line when given two points, do the following: Slope = (y2-y1)/(x2-x1), where (x1, y1) is one point, and (x2,y2) is the second point.


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