Find what y(2) equals if y is a function of x which satisfies: xy^5*y′=1 given y=6 when x=1 I got y(2)=sqrt(6ln(2)-46656) but this answer is wrong can anyone help me figure out the right answer and how I went wrong?

Ayanna Jarvis

Ayanna Jarvis

Answered question

2022-10-26

Find y(2) given y(x) given a separable differential equation
Find what y(2) equals if y is a function of x which satisfies:
x y 5 y = 1
given y = 6 when x = 1
I got y ( 2 ) = 6 ln ( 2 ) 46656
but this answer is wrong can anyone help me figure out the right answer and how I went wrong?

Answer & Explanation

Rylan White

Rylan White

Beginner2022-10-27Added 10 answers

x y 5 y = 1 y 5 d y = d x x 1 6 y 6 = ln ( x ) + C ( x > 0 )
Inserting y ( 1 ) = 6 gives
1 6 6 6 = ln ( 1 ) + C C = 6 5
which yields
y ( 2 ) 6 = 6 ln ( 2 ) + 6 6 y ( 2 ) = ( 6 ln ( 2 ) + 6 6 ) 1 / 6 = 6.000089135987335
snaketao0g

snaketao0g

Beginner2022-10-28Added 2 answers

This equation is again separable (you would benefit from learning how to solve separable equations as they are the most simple class of differential equations to solve).
d y d x x y 5 = 1 y 5 d y = x 1 d x y 6 6 = ln ( x ) + c
Using boundary condition y ( 1 ) = 6 yields
y 6 6 = ln ( x ) + c 6 6 6 = ln ( 1 ) + c 6 5 = c
Then we have solution
y 6 6 = ln ( x ) + 6 5
Now you can plug in whatever value you want.

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