JEE Advanced · Mathematics · 9. Straight Lines
A straight line \(L\) through the point \((3,-2)\) is inclined at an angle \(60^{\circ}\) to the line \(\sqrt{3} x+y=1\). If \(L\) also intersects the \(X\)-axis, then the equation of \(L\) is
- A
\(y+\sqrt{3} x+2-3 \sqrt{3}=0\)
- B
\(y-\sqrt{3} x+2+3 \sqrt{3}=0\)
- C
\(\sqrt{3} y-x+3+2 \sqrt{3}=0\)
- D
\(\sqrt{3} y+x-3+2 \sqrt{3}=0\)
Answer & Solution
Correct Answer
(B)
\(y-\sqrt{3} x+2+3 \sqrt{3}=0\)
Step-by-step Solution
Detailed explanation
A straight line passing through \(P\) and making an angle of \(\alpha=60^{\circ}\), is given by \(\frac{y-y_1}{x-x_1}=\tan (\theta \pm \alpha)\)

where, \(\quad \sqrt{3} x+y=1\)
\[
\Rightarrow \quad y=-\sqrt{3} x+1
\]
Then, \(\quad \tan \theta=-\sqrt{3}\)
\[
\begin{array}{ll}
\Rightarrow & \frac{y+2}{x-3}=\frac{\tan \theta \pm \tan \alpha}{1 \mp \tan \theta \tan \alpha} \\
\Rightarrow & \frac{y+2}{x-3}=\frac{-\sqrt{3}+\sqrt{3}}{1-(-\sqrt{3})(\sqrt{3})} \\
\text { and } & \frac{y+2}{x-3}=\frac{-\sqrt{3}-\sqrt{3}}{1+(-\sqrt{3})(\sqrt{3})}
\end{array}
\]
\[
\begin{array}{ll}
\Rightarrow & y+2=0 \\
\text { and } & \frac{y+2}{x-3}=\frac{-2 \sqrt{3}}{1-3}=\sqrt{3} \\
\Rightarrow & y+2=\sqrt{3} x-3 \sqrt{3}
\end{array}
\]
Neglecting, \(y+2=0\) as it does not intersect \(Y\)-axis.

where, \(\quad \sqrt{3} x+y=1\)
\[
\Rightarrow \quad y=-\sqrt{3} x+1
\]
Then, \(\quad \tan \theta=-\sqrt{3}\)
\[
\begin{array}{ll}
\Rightarrow & \frac{y+2}{x-3}=\frac{\tan \theta \pm \tan \alpha}{1 \mp \tan \theta \tan \alpha} \\
\Rightarrow & \frac{y+2}{x-3}=\frac{-\sqrt{3}+\sqrt{3}}{1-(-\sqrt{3})(\sqrt{3})} \\
\text { and } & \frac{y+2}{x-3}=\frac{-\sqrt{3}-\sqrt{3}}{1+(-\sqrt{3})(\sqrt{3})}
\end{array}
\]
\[
\begin{array}{ll}
\Rightarrow & y+2=0 \\
\text { and } & \frac{y+2}{x-3}=\frac{-2 \sqrt{3}}{1-3}=\sqrt{3} \\
\Rightarrow & y+2=\sqrt{3} x-3 \sqrt{3}
\end{array}
\]
Neglecting, \(y+2=0\) as it does not intersect \(Y\)-axis.
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Mathematics
- Let be defined by Then which of the following statements is(are) TRUE?JEE Advanced 2021 Easy
- Let \(P=\left[a_{i j}\right]\) be a \(3 \times 3\) matrix and let \(Q=\left[b_{i j}\right]\), where \(b_{i j}=2^{i+j} a_{i j}\) for \(1 \leq i, j \leq 3\). If the determinant of \(P\) is 2 , then the determinant of the matrix \(Q\) isJEE Advanced 2012 Medium
- Paragraph:
Tangents are drawn from the point \(P(3,4)\) to the ellipse \(\frac{x^2}{9}+\frac{y^2}{4}=1\) touching the ellipse at points \(A\) and \(B\).Question:
The orthocentre of the triangle \(P A B\) isJEE Advanced 2010 Medium - If the function is defined by , then which of the following statements is TRUE?JEE Advanced 2020 Easy
- Let and be functions defined by and , where denotes the greatest integer less than or equal to for . ThenJEE Advanced 2016 Hard
- Let , where , be a hyperbola in the xy-plane whose conjugate axis subtends an angle of at one of its vertices . Let the area of the triangle be .
The correct option is:LIST-I LIST-II A. The length of the conjugate axis of is P. B. The eccentricity of is Q. C. The distance between the foci of is R. D. The length of the latus rectum of is S. JEE Advanced 2018 Medium
More PYQs from JEE Advanced
- Match the rate expressions in LIST-I for the decomposition of \(\mathrm{X}\) with the corresponding profiles provided in LIST-II. \(X_s\) and \(\mathrm{k}\) are constants having appropriate units.
JEE Advanced 2022 Hard - To check the principle of multiple proportions, a series of pure binary compounds were analysed and their composition is tabulated below. The correct option(s) is(are)
Compound Weight of Weight of JEE Advanced 2022 Hard - Let \(z_k=\cos \left(\frac{2 k \pi}{10}\right)+i \sin \left(\frac{2 k \pi}{10}\right) ; k=1,2, \ldots, 9\)
List - I List - II (A) For each \(z_k\) there exists a \(z_j\) such \(z_k \cdot z_j=1\) (P) True (B) There exists a \(k \in\{1,2, \ldots, 9\}\) such that \(z_1 \cdot z=z_k\) has no solution z in the set of complex numbers (Q) False (C) \(\frac{\left|1-z_1\right|\left|1-z_2\right|\ldots\left|1-z_9\right|}{10}\) equals (R) 1 (D) \(1-\sum_{k=1}^9 \cos \left(\frac{2 k \pi}{10}\right)\) equals (S) 2 JEE Advanced 2014 Hard - Four combinations of two thin lenses are given in List I. The radius of curvature of all curved surfaces is r and the refractive index of all the lenses is 1.5. Match lens combinations in List I with their focal length in List II and select the correct answer using the code given below the lists.
List I List II A. 
B. 
C. 
D.
JEE Advanced 2014 Medium - In the reaction scheme shown below, and are the major products.

The correct structure ofJEE Advanced 2020 Hard - Figure shows three resistor configurations \(R_1, R_2\) and \(R_3\) connected to \(3 \mathrm{~V}\) battery. If the power dissipated by the configuration \(R_1, R_2\) and \(R_3\) is \(P_1, P_2\) and \(P_3\), respectively, then
JEE Advanced 2008 Easy