{2x²-8xy-19y=25
{X²-6y²=250

2x

2

−3xy−19y

2

=25

x

2

−6y

2

=250

x

2

=250+6y

2

2(250+6y

2

)−3

250+6y

2

y−19y

2

=25

7y

2

+3

250+6y

2

y=475

(3

250y

2

+6y

4

)

2

=(475−7y

2

)

2

9(250y

2

+6y

4

)=49y

4

−6650y

2

+225625

2250y

2

+54y

4

=49y

4

−6650y

2

+225625

5y

4

+8900y

2

−225625=0

y

4

+1780y

2

−45125=0

y=5

y=−5

x=20

x=−20