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# Help with finding differential equation constants

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Why bother with a post grad course - waste of time? 17-10-2016
1. I tried working it out using simultaneous eq but im getting k as a weird -73.57 and i know i prob messed my e log rules somewhere.
Attached Images

2. When t=1, N=1200

When t=2, N=1800

Sub those in, try solving simultaneously
3. I did do that but i dont know if my answer is correct. Therefore wanted some workings from the community to check against. Ill try to upload my workings for this soon.
(Original post by Serine Soul)
When t=1, N=1200

When t=2, N=1800

Sub those in, try solving simultaneously
4. Attachment 535989535993Hi,
I tried the question and got:
K= ln(19/8)
B= 9025
N= 4700 (to nearest 100 where t=6)
I solved the equations simultaneously.
Hope this helps
Attached Images

5. Wow thank you sooo much i was struggling with that for some time. I was using simultaneously as well but did not think of it this way.

(Original post by Matt_Braybrook)
Attachment 535989535993Hi,
I tried the question and got:
K= ln(19/8)
B= 9025
N= 4700 (to nearest 100 where t=6)
I solved the equations simultaneously.
Hope this helps
6. (Original post by Jyashi)
Wow thank you sooo much i was struggling with that for some time. I was using simultaneously as well but did not think of it this way.
No problem

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