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WAEC - Further Mathematics (2020 - No. 26)

Which of the following is not an equation of a circle?
3x\(^2\) +3y\(^2\) + 5x + 7y =5
x\(^2\) + y\(^2\) + 5x + 4y = 0
5x\(^2\) + 5y\(^2\) - 16 = 0
x\(^2\) - y\(^2\) + 3x - 5y = 2

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