Dwight invested $12000 total in stocks and bonds. The stocks earned 4.8% annual interest, and the bonds earned 7% annual interest. Together, the total interest earned for one year was $763.
For these problems, let x be the money invested in stocks, and y be the money invested in bonds.
R = interest rate, converted from % to decimal
T = time (# of years for annual)
Also remember, to convert a % to a decimal, divide the % by 100.