Question 440671
-3x-4y=9	.............1	
9x+10y=-3	.............2	
Eliminate y								
multiply (1)by 		10						
Multiply (2) by		4						
-30x-40	y=90		
36x+40y=-12		
Add the two equations								
6x=78		
/6							
x=13						
plug value of 	x	in (1)				
-3x-4y=9		
-39-4y=9		
-4y=9+39
-4y=48		
y=-12