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  1. Chapter 7 Class 10 Coordinate Geometry
  2. Serial order wise
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Transcript

Ex 7.4, 2 Find a relation between x and y if the points (x, y), (1, 2) and (7, 0) are collinear. Let A(x, y), B (1, 2) and c (7, 0) be the 3 collinear Points If the above Points are collinear, they will lie on the same line, i.e. they will not form a triangle . x3 = 7, y3 = 0 Putting the values 1/2 [๐‘ฅ(2 โˆ’0)+1 (0โˆ’๐‘ฆ)+7(๐‘ฆ โˆ’2)] = 0 x (2) + 1 (โˆ’y) + 7 (y โˆ’ 2) = 0 ร— 2 2x โˆ’ y + 7y โˆ’ 14 = 0 2x + 6y โˆ’ 14 = 0 2(x + 3y โˆ’ 7) = 0 x + 3y โˆ’ 7 = 0 โˆด x + 3y โˆ’ 7 = 0 is the required relation between x and y.

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.