Differential Equations — Class 12 Maths Solution

exemplar objective MCQ NCERT EXEMP.Q.62,Page.199
Question

The curve for which the slope of the tangent at any point is equal to the ratio of the abcissa to the ordinate of the point is

  • (a) an ellipse
  • (b) parabola
  • (c) circle
  • (d) rectangular hyperbola ✓ Correct
Step-by-step Solution
Correct answer: option (d)

Slope of tangent to the curve $= \frac{{dy}}{{dx}}$

and ratio of abscissa to the ordinate $= \frac{x}{y}$

According to the question,

$\frac{{dy}}{{dx}} = \frac{x}{y}$

$ydy = xdx$

On integrating both sides,

we get
$\frac{{{y^2}}}{2} = \frac{{{x^2}}}{2} + C$

$\Rightarrow$ $\frac{{{y^2}}}{2} - \frac{{{x^2}}}{2} = C \Rightarrow {y^2} - {x^2} = 2C$

which is an equation of rectangular hyperbola.

NCERT & Exemplar solution for CBSE Class 12 Mathematics, Differential Equations. Curated by Sachin Sharma. Free for all students.