2x+4y=5(x-y); x^2-y^2=6 система

Question

2x+4y=5(x-y); x^2-y^2=6 система

Answer 1

2x+4y=5x-5y

9y-3x=0

3y-x=0 x=3y

 

(x-y)(x+y)=6

2y*4y=6

y^2=3/4

y=+-sqrt(3)/2

x=+-3sqrt(3)/2