Question 911700
x=amount invested at twelve percent
y=is equal to the amount at six percent.
I know that the amount at twelve percent plus the amount at six percent is equal to 1300.
x+y=1300
We also know that three hundred dollars is invested plus thirteen hundred dollars which equals 1600 dollars. The interest rate times sixteen hundred is the total interest of the investment.
.09*1600=144
I know that three hundred times eleven percent is equal to 33
.11*300=33
33+.12x+.06y=144
.12x=144-33-.06y
.12x=111-.06y
x=925-1/2y
x+y=1300
925-1/2y+y=1300
925+1/2y=1300
1/2y=375
y=750
x=925-1/2*750
x=925-375
x=550