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One characteristic of a line is that the length continues on forever.You can only find the length of a line segment.
The closer the lines the steeper the grade.
y - 4 is not an equation so does not form a line. y = 4 is a horizontal line as every co-ordinate has the y value of 4.
If you mean points of (4,-1) and (-1, 4) then the slope of the line works out as -1
Since the equation y = -4 represents a horizontal line, then the slope of the line is 0.