Question 415096
7.00%		per annum-------------	x
3.00%		per annum	------------	y
total investment	23000			
Interest-----	$1,410.00			

x+y=23000------------------------1				
7.00%x	+3.00%y	=$1,410.00-------------2
Multiply by 100							
7x+3y=$141,000.00		--------2	
									
Multiply (1) by			-7						
we get									
									
-7x-7y=	-161000			
									
Add this to (2)									
									
-4y=-$20,000.00			
									
divide by -4							
									
y=$5,000.00	investment at 	3.00%
Balance	$18,000.00 investment at	7.00%