WBJEE: Important Questions and Preparation Tips – Straight Lines

In this article, engineering aspirants will get complete chapter notes of chapter Straight Lines prepared by Subject Experts of Mathematics for WBJEE entrance examination 2018. Students always get 2-4 questions from this topic in the examination.

These notes are based on the latest syllabus of WBJEE examination including important concepts, formulae and some previous year solved questions of the examination.

These notes are prepared after the detailed analysis of few last year papers of the examination including all important topics related to Straight Lines like distance between two points, coordinates of the point divide any line segment, area of triangle, inclination of line, angle between two lines, equation of horizontal line, equation of vertical line, point-slope form of a line, two-point form of a line, slope-intercept form of a line, normal form of a line, distance of a point from a line, perpendicular distance between two lines etc.

The concepts given in these notes are explained in a very detailed manner which will help aspirants in their preparation.

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Important Concepts:

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Some previous years solved questions are given below:

Question 1:

Solution 1:

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Question 2:

Solution 2:

 Hence, the correct option is (a).

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Question 3:

Solution 3:

Hence, the correct option is (b).

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 Question 4:

(a) 1                                     

(b) 2

(c) 4                                     

(d) 5

Solution 4:

Let the required point be (h, k)

The distance from the straight line x – 2y + 1 = 0

Any one of equations (1) combined with any one of equations (2) will yield 4 points.

Hence, the correct option is (c).

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Question 5:

The straight lines x + y = 0, 5x + y = 4 and x + 5y = 4 form

(a) an isosceles triangle

(b) an equilateral triangle

(c) a scalene triangle

(d) a right angled triangle

Solution 5:

Their points of intersection are (–1, 1) (1, –1) and (2/3, 2/3)

Using distance formula the distance between AB and BC is same so, ABC is isosceles triangle.

Hence, the correct option is (a).

Physics all chapters complete notes for WBJEE 2018

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