Question 426896
y-x =5
10y+x= 2(10x+y)+7
10y+x=20x+2y+7
8y-19x=7

-x+y=5	.............1	
-19x+8y=7.............2	
								
multiply (1)by 	-8						
Multiply (2) by	1						
8x-8y=-40		
-19x+8y=7		
								
Add the two equations								
								
-11x				=	-33		
								
/-11							
								
x=	3 		
								
plug value of x	in (1)				
								
-x+y=5		
-3+y=5		
y=5+3
y=8		
The number is 38