Question

A differential equation of first order and first degree is

• A. $x \left( \frac { d y } { d x } \right) ^ { 2 } - x + a = 0$
• B. $\frac { d ^ { 2 } y } { d x ^ { 2 } } + x y = 0$
• C. $d y + d x = 0$
• D. None of these

Answer 1

Answer: (C)

$d y + d x = 0$

Answer 2

Option (1) First order and second degree.

Option (2) Second order and first degree.

Option (3) First order and first degree.

i.e., $d y + d x = 0$or $\frac { d y } { d x } + 1 = 0$.