Question 629077
{{{x^2+y^2=25}}} ----- A
{{{x^2-y^2=7}}} ------ B

using elimination method
=> {{{ 2x^2 = 25 + 7 }}}
=> {{{ x^2 = 32 / 2}}}
=> x = (4, -4)
Let x = 4 => {{{ 4^2 - y^2 = 7}}} ---- B
=> y = (3, -3)
Hence (x, y) = {(4, -3), (-4, -3) (4, 3), (-4, 3)}