If point a has coordinates (x1,y1), and point b has coordinates (x2, y2), then the slope of the line is given by the formula:
m = (y2-y1)/(x2-x1).
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If the slope of a line is m then the slope of an altitude to that line is -1/m.
The slope of both lines will be the same.
To find the slope of a perpendicular line, take the negative reciprocal of the slope of the given line. (Flip the top and bottom of the fraction and change the sign.) The slope of 3 can be written as 3/1. The slope of a line that is perpendicular is -1/3.
A straight, horizontal line.