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Line k passes through points (-3,-6) and (-1,12) what is the slope of the line perpendicular to line c

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Do you mean "perpendicular to k"? We have no line c there so I'm going with line k. First we need the slope of line k. Fitting those values into the slope formula we have
m= (12-(-6))/(-1-(-3)) = (18)/(2) =9. So the slope of k is 9. The slope of a line perpendicular to k has the opposite sign and the fraction is flipped. The perpendicular slope then is -1/9.
User Dixit
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