Hi

referring to the standard slope-intercept form for an equation of a line y = mx + b

  where m is the slope and b the y-intercept.  

y= 5/8x –2 has a slope m = (5/8). A line ⊥ to it would have a slope m = -8/5

as ⊥ lines have slopes that are 'negative reciprocals' of one another 

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