exam Maths Puzzle Numerical Ability

Tutor could you help me please? I didn't know under what category I should have placed this question, I apoligize if I did not place this under to correct area. This is a Punnett

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Can you please help me to write an equation for a direct variation with a graph that passes through these points: (9, -1) s^2 + 2s - 8/s^2 + 3s - 10 * s + 5/ s^2 - 16