Problem 02 | Exact Equations

Problem 02
(6x+y2)dx+y(2x3y)dy=0
 

Solution 02
(6x+y2)dx+y(2x3y)dy=0
 

M=6x+y2

N=y(2x3y)=2xy3y2
 

Test for exactness
My=2y

Nx=2y

Exact!
 

Let
Fx=M

Fx=6x+y2

F=(6x+y2)x
 

Integrate partially in x, holding y as constant

Problem 01 | Exact Equations

Problem 01
(x+y)dx+(xy)dy=0
 

Solution 01
(x+y)dx+(xy)dy=0
 

Test for exactness
M=x+y   ;   My=1

N=xy   ;   Nx=1

My=Nx   ;   thus, exact!
 

Step 1: Let
Fx=M

Fx=x+y