with intial conditions

show that S and P satisfy a conservation law given by S+P = c,

for some constant c, and find the value of c. Hence determine

I know that if you add the two equations you get a 0, is that what c equals?

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- May 19th 2013, 12:19 PMTweetydifferential equation help,

with intial conditions

show that S and P satisfy a conservation law given by S+P = c,

for some constant c, and find the value of c. Hence determine

I know that if you add the two equations you get a 0, is that what c equals? - May 19th 2013, 03:39 PMHallsofIvyRe: differential equation help,
From and subtracting, .

We also have S+ P= c for constant c, differentiating both sides, we have .

So subtracting the second equation from the first, we have from which it follows that P(t) is a constant. - May 20th 2013, 05:12 AMTweetyRe: differential equation help,
Sorry I have written out the equation wrong, I have now corrected it, also I dont understand how you got a minus, after differentiating both sides s+p = c.?

- May 20th 2013, 05:15 AMTweetyRe: differential equation help,