Question 1207481

x + y = 10000
.06x + .07y = 660

From equation (1)
x = 10,000 - y

Substitute into (2)
.06x + .07y = 660

.06(10,000 - y) + .07y = 660

600 - .06y + .07y = 660

- .06y + .07y = 660 - 600

.01y = 60

y = 60/.01

y = 600

Substitute the value of y into equation (1)
x + y = 10,000
x + 600 = 10,000
x = 10,000 - 600
x = 9400

Therefore, $9,400 was placed in the account which pays 6% interest rate and $600 was placed in the account which pays 7% interest rate