CBSE Class 9 Answered
if (2,-1),(p,5)and (p-3,4) are collinear points . find p.
Asked by kissi_1995 | 21 Jul, 2009, 07:08: PM
Expert Answer
If three points are collinear then
x1(y2 -y3) +x2(y3 -y1) +x3(y1 -y2) =0
A(2,-1) :B (p ,5) C (p-3 ,4)
2(5 -4) +p[4-(-1)] +p-3(-1 -5) =0 [solving this eq] .......I
2 +5p -6p +18 =0
-p +20 =0
p =20Ans ( substitute the value of p in the above equation I to check )
Answered by | 22 Jul, 2009, 12:37: PM
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