A resting heart rate for men on a chart say 62-65 beats per minute puts men in the good category of scott counted 238 heart beat
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If a line's slope is 
, the slope of the perpendicular line is 
in this case, the given line has a slope 4, which is 4/1, so the perpendicular line has a slope/gradient
in this case, the given line has a slope 4, which is 4/1, so the perpendicular line has a slope/gradient