Question 406498
y=6-2x
2x+y=6
5y+8x=20
8x+5y=20
...

2x+1y=6	.............1	
8x+5y=20.............2	
								
multiply (1)by 	-4			
			
-8x-4y	=-24		
8x+5y=20		
								
Add the two equations								
								
y=-4
plug value of y in 1
we get 
2x-4=6
2x=10
x=5