Medium MCQ +4 / -1 PYQ · JEE Mains 2024

The solution curve, of the differential equation $2 y \frac{\mathrm{d} y}{\mathrm{~d} x}+3=5 \frac{\mathrm{d} y}{\mathrm{~d} x}$, passing through the point $(0,1)$ is a conic, whose vertex lies on the line :

  1. A $2 x+3 y=-9$
  2. B $2 x+3 y=-6$
  3. C $2 x+3 y=9$ Correct answer
  4. D $2 x+3 y=6$

Solution

<p>$$\begin{aligned} & 2 y \frac{d y}{d x}+3=5 \frac{d y}{d x} \\ & 2 y d y+3 d x=5 d y \\ & y^2+3 x=5 y+\left.c\right|_{(0,1)} \\ & 1+0=5+c \\ & c=-4 \\ & y^2-5 y=-3 x-4 \\ & y^2-5 y+\frac{25}{4}-\frac{25}{4}=-3 x-4 \\ & \left(y-\frac{5}{2}\right)^2=-3 x+\frac{9}{4} \\ & \left(y-\frac{5}{2}\right)^2=-3\left(x-\frac{3}{4}\right) \\ & \left(\frac{3}{4}, \frac{5}{2}\right) \text { satisfies by } 2 x+3 y=9 \end{aligned}$$</p>

About this question

Subject: Mathematics · Chapter: Differential Equations · Topic: Order and Degree

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