Question 149209
x=9% money
y=8% money
coefficient=percent


x+y=9000----------------------because there was $9000 extra
9x+8y=77000-------------------because 9% x + 8% y= 77000% (or 770)


Solve for x in the first equation
x=9000-y


Plug that in
9(9000-y)+8y=77000


Distribute the 9 to the parentheses
81000-9y+8y=77000


Combine like terms
81000-y=77000


Subtract 81000 from both sides
-y=-4000


Divide by -1
y=4000


y=8% money


money invested at 8%: $4000