SOLUTION: S=(a-rl)/(1-r) solve for l we get l=(a-S-Sr)/r Bagatrix solver tells us the Sr should be positive, what step did we miss or mess up on.

Algebra ->  Equations -> SOLUTION: S=(a-rl)/(1-r) solve for l we get l=(a-S-Sr)/r Bagatrix solver tells us the Sr should be positive, what step did we miss or mess up on.      Log On


   

Question 221220: S=(a-rl)/(1-r) solve for l we get l=(a-S-Sr)/r Bagatrix solver tells us the Sr should be positive, what step did we miss or mess up on.
Found 2 solutions by rapaljer, RAY100:
Answer by rapaljer(4671) About Me  (Show Source):
You can put this solution on YOUR website!
S=(a-rl)/(1-r)

Multiply both sides by 1-r:

S(1-r) = a-rl
S-Sr=a-rl

I would add +rl to each side:
S-Sr+rl =a

Then I would subtract S and add +Sr to each side:
rl=a -S +Sr

Divide both sides by r:
l=(a-S+Sr)/r

R^2



Answer by RAY100(1637) About Me  (Show Source):
You can put this solution on YOUR website!
S = (a-rl) / (1-r)
.
S*(1-r) = (a-rl)
.
S-Sr = a-rl
.
S-Sr -a = -rl
.
(S-Sr-a) / -r = l
.
(-S+Sr +a)/r = l
.
(a-S+Sr)/r = l