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Ex 9.2, 7 - Chapter 9 Class 11 Straight Lines
Last updated at August 17, 2026 by Teachoo
Chapter 9 Class 11 Straight Lines
Concept wise
- Cordinate geometry questions
- Slope - Finding slope
- Slope - Prependicularity
- Angle between two lines by Slope
- 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
Ex 9.2, 7 Find the equation of the line which passes through the points (โ1, 1) and (2, โ4). We know that equation of line through two points (x1, y1) & (x2, y2) is ๐ฆ โ ๐ฆ_1 = (๐ฆ_2 โ ๐ฆ_1)/(๐ฅ_2 โ ๐ฅ_1 ) (๐ฅ โ ๐ฅ_1) Since equation of the line through the points (โ1, 1) and (2, โ4). Here, x1 = โ1, y1 = 1 & x2 = 2, y2 = โ4 Putting values (y โ 1) = ( โ4 โ 1)/(2 โ ( โ1)) (x โ (โ1)) (y โ 1) = ( โ5)/(2 + 1) (x + 1) (y โ 1) = ( โ5)/3 (x + 1) 3(y โ 1) = โ5(x + 1) 3y โ 3 = โ5x โ 5 5x + 3y + 2 = 0 Hence, the required equation is 5x + 3y + 2 = 0
