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07-06-2016
Mathematics

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ab and cb form a right angle at the point of intersection B. If the coordinates of A and B are (8, 0) and (2, 1) respectively, then what is the equation of cb ?

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taskmasters taskmasters

11-06-2016

Calculating the slope of AB:

m = (0-1)/(2-8) = (1/6)

knowing that CD must be perpendicular, this means it has the negative reciprocal of the slope of AB.

This means that the slope of CD is -6

Using the point-slope formula

(y-1) = -6(x-2)

6x + y =13

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