Let r = log9 31, s = log6 31, t = log9 6.
Write the following expressions in terms of r, s, and/or t. The change of base formula may be helpful in finding some of these logarithms.
log 9 base 31
The Attempt at a Solution
I am not sure where to begin. I am confident with the different rules for logarithms such as log 5 + log 4 = log 20, but i am not sure how to switch bases. I am sure it has something to do with the equation r= log 31 base 9. All i am asking for is a little guidance.