Higher June 2022 Paper 2 Q21

21 Which of these is the equation of a circle?

Circle your answer. [1 mark]

• \(x^2 - y^2 = 6\)
• \(x^2 + y^2 = 6\)
• \(y = x^2 - 6\)
• \(y = x^2 + 6\)