Question 433575
	Unit A-------------	x 	Numbers					
	Unit B	------------	y	Numbers					
2x+3y=18	.............1		
80x+60y=480.............2		
Eliminate y									
multiply (1)by 	-20							
Multiply (2) by	1							
-40x-60	y=-360			
80x+60y=480			
Add the two equations									
40x=120			
/40								
x=3 Unit A			
plug value of 			x	in (1)					
2x+3y=18			
6+3y=	18			
3y=18-6	
3y=12			
y=4	Unit B