Mr. walker invested $65,100 in two banks, one paying 4.5% and the other 6%. if he gets $231 more on the 6% investment than that on the 4.5% investment, find the total annual income from the banks.

So assume 4.5% is x, and 6% is y.
The two equations are x+y=65100 and 0.06y = 0.045x + 231
If you solve the equation, you can see he invested 30100 in the 6%, and 35000 in 4.5%. Then you just figure out how much he made.
He made $3381.