Thread: solve for x problem

stuck on this on



solve for r

also how do you make a divide a straight line in this forum?

multiply both sides by l - r

s(l - r) = a
sl - sr = a

rearrange
sl - a = sr

sr = sl - a

divide both sides by s

r = l -a/s

I think

Originally Posted by Joel

multiply both sides by l - r

s(l - r) = a
sl - sr = a

rearrange
sl - a = sr

sr = sl - a

divide both sides by s

r = l -a/s

I think

s = a
divide
1 - r

Originally Posted by realistic

s = a
divide
1 - r

Huh?

Do you mean s = a / (l - r)
What you posted means s = (a/l) minus r

Originally Posted by Wilmer

Huh?

Do you mean s = a / (l - r)

yeah this


like i had in original post

Originally Posted by realistic

yeah this

like i had in original post

Ok; so a = l(s + r)
a = ls + lr
Can you not finish it?

Originally Posted by Wilmer

Ok; so a = l(s + r)
a = ls + lr
Can you not finish it?

the answer is r = s-a/s In the book i have

anyone know how to get this answer ?

Originally Posted by realistic

the answer is r = s-a/s In the book i have

anyone know how to get this answer ?

If you learn to use the LaTex markup tags and that will help make things more clear in the future. You would enter \frac{a}{1-r} between the "math" tags.

Anyway,



Multiply both sides by 1-r



Use distributive law



Subtract both sides by s



Almost there, now divide both sides by -s (minus s)



All the cool kids move the negative sign up from the denominator



Distributing the minus sign (which is really a -1)



Now rearranging the numerator so the positive term comes first

ok thanks i see now