Question

How is this differential equation simplified (Specifically, what happens under absolute sign): http://img23.imageshack.us/img23/5734/math1z.png

Answer 1

I understand how this problem works, I just don't understand why (y-4) is turned into (4-y)

Answer 2

i cant open the link.

Answer 3

can u draw?

Answer 4

Can you see this?

Answer 5

4-y=e^kt e^c
-y=e^kt e^c -4
-y+4=e^kt e^c
-[-y+4=e^kt e^c]-
y-4=-e^kt e^c
y=4-e^kt e^c or y=4-Ae^kt