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Question 1 - Collinearity of 3 points by sliope - Chapter 9 Class 11 Straight Lines
Last updated at August 17, 2026 by Teachoo
Collinearity of 3 points by sliope
Chapter 9 Class 11 Straight Lines
Concept wise
- Cordinate geometry questions
- Slope - Finding slope
- Slope - Prependicularity
- Angle between two lines by Slope
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Collinearity of 3 points by sliope
- Point Slope form
- Slope-Intercept form
- Intercept form
- Normal form
- Given Statement
- Two lines // or/and prependicular
- Angle between two lines
- Distance - Between two parallel lines
- Distance of a point from a line
- Distance of a point from a line along a line
- Other Type of questions - Area of Triangle formed
- Other Type of questions - 3 lines Concurrent
- Other Type of questions - Image
- Other Type of questions - Mix
Transcript
Ex10.1, 8 Find the value of x for which the points (x, โ1), (2, 1) and (4, 5) are collinear. Let the three points be A (x, โ1) , B (2, 1) , C (4, 5) If 3 points are collinear Slope of AB = Slope of BC We know that slope of a line through the points (x1, y1)(x2, y2)is m = (๐ฆ2 โ ๐ฆ1)/(๐ฅ2 โ ๐ฅ1) 2 = 4 โ 2x 2 โ 4 = -2x -2 = -2x ( โ 2 )/( โ 2) = x 1 = x x = 1 Hence value of x is 1
