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Question

Find the points of trisection of the line segment joining the points :

(i) (5, -6) and (-7, 5), (ii) (3, -2) and (-3, -4), (iii) (2, -2) and (-7, 4).

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Solution

Point of trisection divides the line in the ratio of either 1:2 or 2 :1
Point dividing a line in the ratio 1:m formed by joining x1 y1 and x2 y2
x = fraction numerator m x subscript 1 plus x subscript 2 over denominator 1 plus m end fraction y = fraction numerator m y subscript 1 plus y subscript 2 over denominator 1 plus m end fraction

Point dividing a line in the ratio m:1 formed by joining (xblank subscript 1,yblank subscript 1) and (xblank subscript 2, yblank subscript 2)
x = fraction numerator x subscript 1 plus m x subscript 2 over denominator 1 plus m end fraction y = fraction numerator y subscript 1 plus m y subscript 2 over denominator 1 plus m end fraction


(i) (5,-6) and (-7,5)

x = fraction numerator 2 left parenthesis 5 right parenthesis minus 7 over denominator 3 end fraction equals fraction numerator begin display style 3 end style over denominator 3 end fraction equals 1 or fraction numerator 2 left parenthesis negative 7 right parenthesis plus 5 over denominator 3 end fraction equals negative 3
y = fraction numerator 2 left parenthesis negative 6 right parenthesis plus 5 over denominator 3 end fraction equals fraction numerator negative 7 over denominator 3 end fraction or fraction numerator 2 left parenthesis 5 right parenthesis minus 6 over denominator 3 end fraction equals 4 over 3


(ii) (3,-2) and (-3,-4)

x = fraction numerator 2 left parenthesis 3 right parenthesis minus 2 over denominator 3 end fraction equals 4 over 3 or fraction numerator 2 left parenthesis negative 3 right parenthesis minus 3 over denominator 3 end fraction equals negative 3
y = fraction numerator 2 left parenthesis negative 2 right parenthesis minus 4 over denominator 3 end fraction equals fraction numerator negative 8 over denominator 3 end fraction or fraction numerator 2 left parenthesis negative 4 right parenthesis minus 2 over denominator 3 end fraction equals fraction numerator negative 10 over denominator 3 end fraction

(iii) (2,-2) and (-7,4)

x = fraction numerator 2 left parenthesis 2 right parenthesis minus 7 over denominator 3 end fraction equals negative 1 or fraction numerator 2 left parenthesis negative 7 right parenthesis plus 2 over denominator 3 end fraction equals negative 4
y = fraction numerator 2 left parenthesis negative 2 right parenthesis plus 4 over denominator 3 end fraction equals 0 or fraction numerator 2 left parenthesis 4 right parenthesis minus 2 over denominator 3 end fraction equals 2


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