System of equations?
 

I hope this is the correct place to post this.

I have 4 equations with 4 unknowns. Let's assume the lower case letters represent different numbers that are known constants.

A = B/s
B = C/t
C = D/u

A + B + C + D = 10

Can anyone give me some hints on how to solve this? Thanks!

Re: System of equations?
 

I may be missing something...but problem makes little sense:
just get any 4 numbers that equal 10: as example, 1,2,3,4: A=1, B=2, C=3, D=4.

A = B/s : s = B/A = 2/1 = 2
B = C/t : t = C/B = 3/2
C = D/u : u = D/C = 4/3

Re: System of equations?
 

C=D/u
B=C/t=D/(ut)
A=B/s=D/(stu)

D[1 + 1/u + 1/(ut) + 1/(stu)] = 10

I assume you can go from here.

Re: System of equations?
 

Thanks! That worked perfectly! Never would have thought to do it that way...

Any way that you've been taught (or can find) to solve simultaneous linear equations would have worked.