Hi,
I keep running into a road block which I think means either I'm
missing something simple, or I'm thinking about things the wrong way.
I'm fairly new to sage, and CAS in general, so either is possible.
Here's a simple example of what I'm doing.
Lets give ourselves two symbolic equations:
sage: var("a b c d e")
sage: e1 = a == b + c
sage: e2 = d == e * a
Now, lets say I want to know what c is in terms of b, d & e. By hand
I'd substitute e1 in e2, and then solve for c.
sage: e3=e2.subs(a=b+c)
sage: solve(e3, c)
[c == (d - b*e)/e]
All fine, but note that I had to enter e1 into the substitution
explicitly. I've yet to find a way of substituting one symbolic
equation into another.
Is there a way?
Where am I going wrong?
Thanks
Paul
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