Question 1016203
x=9%
y=18% (can do this with one variable, too)
x+y=30,000
.09x+0.18(y)=.15*30,000=4500
============
x+y=30000
9x+18y=450000
-9x-9y=-270000, multiplying the top by -9
9y=180,000
y=20,000 @18%=$3600
x=10,000@9%=$900
They add to $4500.