Question

{x^2+4y^2=8 {2x^2-y^2=7

Answer 1

х^2 = 8- 4у^2
16-8у^2 - у^2 =7

х^2 = 8- 4у^2
9у^2 =9

х^2 = 8- 4у^2
у^2 = 1

у1= 1
у2= -1
х1 = 2
х2= 2√3