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It is a quadratic equation in the form of y2-4y-5 = 0 and will have two solutions:

When factorised:

(y-5)(y+1) = 0

Therefore: y = 5 or y = -1

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Q: What is y squared minus 4y minus 5?
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What are the points of intersection when the line x -y equals 2 crosses the curve x squared - 4y squared equals 5?

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