Question 429501
rooms with kitchen		x 								
rooms without kitchen	------------	y								
x+y=200	.............1				
100x+80	y=17000	.............2				
Eliminate y											
multiply (1)by 		80									
Multiply (2) by		-1									
80x+5y=16000					
-100x+2	y=-17000					
Add the two equations							
-20x=-1000					
/-20										
x=50 rooms with kitchen					
											
plug value of x	in (1)							
											
x+y=200					
50	+	y=200					
y=150 rooms without kitchen