Solving equations x-y=1 2xy=2

Solving equations x-y=1 2xy=2

Eliminate y to get 2x (x-1) = 2
That is, X (x-1) = 1, so x = (1 + radical 5) / 2, corresponding to y = (radical 5-1) / 2
Or x = (1-radical 5) / 2, corresponding to y = (- radical 5-1) / 2
The root formula is used here!
You have to understand!