1...The square difference of two numbers is 25 and the twice of the first is 1 greater than the second. Find the two numbers

1) (x-y)^2=25
2) 2x=y+1 


y=2x-1 
so that

(x-(2x-1))^2=25 

which leads to: 

x={-4, 6} 
y={-9, 11} 

solutions: {(-4,-9), (6,11)}