9(4) = 36
5(9) = 45
6(4) = 24
x+y=12000
y=12000-x
(x)(.0615)+y(.06)=12736
x(.0615)+(12000-x)(.06)=12736
Let me know if you need more help. This is a system of equations problem I believe.
Answer:

Step-by-step explanation:
Given the function
, to find
, simply substitute
into the function.
Solving, we get:
