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If the slope of a line is m then the slope of an altitude to that line is -1/m.
If a line has a slope m then a line perpendicular to it has a slope -1/m ( negative inverse). For example if a line has slope positive 2, its perpendicular has slope -1/2
The equation for a straight line is y = mx+b whereas m is the slope and b is the y intercept For example: y = 3x+9 which means that 3 is the slope and 9 is the y intercept
No, parallel lines have exactly same slope Perpendicular line have a slope that is negative reciprocal of each other that is if m = slope of line then slope of perpendicular line is -1/m
The slope is normally represented by m so it is 0.