Question

Make r the subject of the formula t= r/r-3

Answer 1

r = 3t/t-1

Explanation:

t = r/r-3

1. times both sides by r-3

t(r-3) = r

= tr - 3t = r

2. add 3t to both sides

tr = 3t + r

3. minus r

tr - r = 3t

4. factorise out r

r(t-1)=3t

5. divide by t-1

r = 3t/t-1