Question

Sa se rezolve sistemul:
x+y=0
xy= -1
va rog frumos ajutati ma :(

Answer 1

$\left \{ {{x+y=0} \atop {xy=-1}} \right. \left \{ {{x=-y} \atop {-y*y=-1}} \right. \left \{ {{x=-y} \atop {-y^2=-1}} \right. \left \{ {{x=-y} \atop {y=1}} \right. \left \{ {{x=-1} \atop {y=1}} \right.$