Question

Solve by substitution:
{x^2+y^2=25
y-5=-x^2

Answer 1

find y from second one\[y=5-x^2\]put it in the first one\[x^2+(5-x^2)^2=25\]for solving this equation let \(u=x^2\) u will get a quadratic in terms of \(u\)\[u+(5-u)^2=25\]let me know if its still unclear

Answer 2

yes it is actually unclear