SOLUTION: please help me solve the following problem. I get very confused with the letters instead of numbers as denominators. 1/a+2/b+3/c

Algebra ->  Equations -> SOLUTION: please help me solve the following problem. I get very confused with the letters instead of numbers as denominators. 1/a+2/b+3/c      Log On


   

Question 197478: please help me solve the following problem. I get very confused with the letters instead of numbers as denominators. 1/a+2/b+3/c
Found 2 solutions by edjones, josmiceli:
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
1/a+2/b+3/c
=(bc+2ac+3ab)/(abc)
.
Ed

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
It has to equal something to solve it, like:
+1%2Fa%2B2%2Fb%2B3%2Fc+=+407
It can't be solved the way it is.
For an equation with 3 unknowns, you need
2 more equations to solve it.
If you know what any 2 of the unknowns are,
you can solve for the remaining one.
a+=+3
b+=+7
1%2F3+%2B+2%2F7+%2B+3%2Fc+=+407
Multiply both sides by 21c. The is the common denominator
7c+%2B+6c+%2B+63+=+407
13c+=+344
c+=+26.461