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9709/11 · Oct/Nov 2022 · Q8b3/4
  1. y = 2 − 3 / (4x − p)
  2. (y − 2)(4x − p) = −3M1
  3. 4x = p − 3 / (y − 2)M1
  4. f⁻¹(x) = p/4 + 3/(4x − 8)✗

Method right all the way — the sign of the 3 slipped on the last line, so the accuracy mark is lost. Check the sign when you divide by (y − 2).

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