X22y24 X2 y24 solveSolutionSubtracting 2nd equation from 1st

X^2+2y^2=4
X^2- y^2=4     solve

Solution

Subtracting 2nd equation from 1st equation, we get

3y² = 0

or, y = 0

So, x² + 2y² = 4

or, x² = 4

or, x = -2 and 2

So, x = -2 and y = 0

or, x = 2 and y = 0