решите
2х^2+3у^2=14,
-х^2+2у^=7

2x^2 + 3y^2 = 14

-x^2 + 2y^2 = 7

2x^2 + 3y^2 = 14

-2x^2 + 4y^2 = 14

2x^2 + 3y^2 = -2x^2 + 4y^2

2x^2 + 2x^2 = -3y^2 + 4y^2

4x^2 = y^2

2x = y

y = 2x