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Grade 9 · Functions & Relationships
Functions & Relationships (Grade 9)
MEMORANDUM
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  / 18

Answer all questions. Show all your working — marks are awarded for method as well as the final answer. Teacher copy: accept any correct equivalent method.

  1. 1
    If y = 2x + 7, find y when x = 5.
    (2)
    10 + 7 = 17✓✓ (2)
  2. 2
    If y = 5x − 3, find y when x = 4.
    (2)
    20 − 3 = 17✓✓ (2)
  3. 3
    If y = 5x − 3, find x when y = 32.
    (2)
    5x = 35 → x = 7✓✓ (2)
  4. 4
    If y = 4x + 1, find x when y = 21.
    (2)
    4x = 20 → x = 5✓✓ (2)
  5. 5
    Rule: ×3 then +4. Find the output for input 6.
    (2)
    18 + 4 = 22✓✓ (2)
  6. 6
    Find the rule: 1→4, 2→7, 3→10.
    (2)
    Differences of 3 → y = 3x + 1✓✓ (2)
  7. 7
    Find the rule: 1→2, 2→4, 3→6.
    (2)
    y = 2x✓✓ (2)
  8. 8
    If y = x2 − 2, find y when x = 6.
    (2)
    36 − 2 = 34✓✓ (2)
  9. 9
    Write "multiply by 5 then subtract 1" as a formula.
    (2)
    y = 5x − 1✓✓ (2)
TOTAL: 18 marks
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