Question

Решите систему уравнений
x^2+9y^2-6xy=y-x
x-3y=-1

Answer 1

Х - 3y = - 1
X = 3y - 1
•••••••••••
X^2 + 9y^2 - 6xy = y - x
( 3y - 1 )^2 + 9y^2 - 6y( 3y - 1 ) = y - ( 3y - 1 )
9y^2 - 6y + 1 + 9y^2 - 18y^2 + 6y = y - 3y + 1
- 2y = 0
y = 0
X = - 1
Ответ ( - 1 ; 0 )