When a system of equations is graphed and they are the same line, what is the solution?

Which one ? is the answer and how to find this answer

00 points ! missy’s rotation maps point k(17, –12) to k’(12, 17). which describes the rotation? 270° counterclockwise rotation 90° counterclockwise rotation 90° clockwise rotation 180° rotation

If the discriminant if a quadratic equation is 4 which statement describes the roots?