I was trying to find the intersection points of these function

f1=sym('y=x^3');

f2=sym('x^2+y^2=1');

S=solve(f1,f2,x,y);

solx=eval(S.x);

soly=eval(S.y);

I can't do eval(S.x) because i receive the error

Undefined function or variable 'z'.

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