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slope of any line perpendicular through points (0,5) and (-3,-4)
m= 5-(-4)/0-(-3)=9/3=3
am I doing this right
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the slope of a line is dy/dx (change in y / change in x)
so we would have
m = [ 5 - (-4) ] / [ 0 - (-3) ] = 9 / 3 = 3, so yes correct, although you need brackets around the first division.
two lines are perpendicular, when the the product of their slopes is -1
m[sub]1[/sub]m[sub]2[/sub] = -1
m[sub]2[/sub] = -1 / m[sub]1[/sub] = -1/3
Last edited by luca-deltodesco (2007-01-22 03:43:54)
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