Hi

solving the system by Substitution

y -2x = 0  Or   y = 2x

x^2 + y^2 = 5

x^2 + (2x)^2 = 5

x^2 + 4x^2 = 5

   5x^2 = 5

    x^2 = 1

     x = ± 1

     y = ± 2 

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