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Ex 9.2, 7 - Chapter 9 Class 11 Straight Lines
Last updated at August 8, 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
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Transcript
Ex 9.2, 7 Find the equation of the line which passes through the points (ā1, 1) and (2, ā4). We know that equation of line through two points (x1, y1) & (x2, y2) is š¦ ā š¦_1 = (š¦_2 ā š¦_1)/(š„_2 ā š„_1 ) (š„ ā š„_1) Since equation of the line through the points (ā1, 1) and (2, ā4). Here, x1 = ā1, y1 = 1 & x2 = 2, y2 = ā4 Putting values (y ā 1) = ( ā4 ā 1)/(2 ā ( ā1)) (x ā (ā1)) (y ā 1) = ( ā5)/(2 + 1) (x + 1) (y ā 1) = ( ā5)/3 (x + 1) 3(y ā 1) = ā5(x + 1) 3y ā 3 = ā5x ā 5 5x + 3y + 2 = 0 Hence, the required equation is 5x + 3y + 2 = 0
