Question Details

The solution of the equation (2y – 1) dx-(2x + 3)dy = 0 is

Options

A

2x−1/2y+3 = k

B

2y+1/2x−3 = k

C

2x+3/2y−1 = k

D

2x−1/2y−1 = k

Correct Answer :

2x+3/2y−1 = k

Solution :

The correct option is "2x+3/2y−1 = k" (which represents 2x+32y1=k).

To find the solution to the given differential equation, we can use the method of separation of variables. Let's start with the given equation:
( 2 y 1 ) d x ( 2 x + 3 ) d y = 0

First, we rearrange the equation by moving the term containing dy to the right side of the equation:
( 2 y 1 ) d x = ( 2 x + 3 ) d y

Next, we separate the variables by dividing both sides by (2x+3)(2y1) (assuming 2x+30 and 2y10):
d x 2 x + 3 = d y 2 y 1

Now, we integrate both sides of the equation:
d x 2 x + 3 = d y 2 y 1

Using the integration formula duau+b=1aln|au+b|+C, we evaluate the integrals:
1 2 ln | 2 x + 3 | = 1 2 ln | 2 y 1 | + C'

To simplify, multiply the entire equation by 2:
ln | 2 x + 3 | = ln | 2 y 1 | + 2 C'

Let 2C'=ln|c| where c is an arbitrary constant. Substitute this back into the equation:
ln | 2 x + 3 | = ln | 2 y 1 | + ln | c |

Apply the logarithmic property lnA+lnB=ln(AB) on the right side:
ln | 2 x + 3 | = ln | c ( 2 y 1 ) <|>

By taking the exponential of both sides, we eliminate the logarithms:
2 x + 3 = k ( 2 y 1 )
where k is a constant (representing ±c).

Finally, dividing both sides by 2y1 gives:
2 x + 3 2 y 1 = k

Thus, the solution matches the option: 2x+3/2y−1 = k.

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