Section equation of a curved surface cut by a plane Such as the title. If x ^ 2 + y ^ 2 + Z ^ 2 = 4 is cut by X + y + Z = 0, what is the section equation? I don't want to draw. I want to see pure algebra, because there are many complex drawings that can't be drawn

Section equation of a curved surface cut by a plane Such as the title. If x ^ 2 + y ^ 2 + Z ^ 2 = 4 is cut by X + y + Z = 0, what is the section equation? I don't want to draw. I want to see pure algebra, because there are many complex drawings that can't be drawn

That's it
x^2+y^2+z^2=4
x+y+z=0
The general equation of space curve is represented by the intersection of two curved surfaces