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Grade 9 · Graphs
Straight-Line Graphs: Reading y = mx + c
MEMORANDUM
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Mark
  / 6

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
    For y = 3x + 2, give the gradient and y-intercept.
    (2)
    Gradient 3, y-intercept 2✓✓ (2)
  2. 2
    For y = −x + 5, where does it cross the y-axis?
    (1)
    At (0 ; 5)✓ (1)
  3. 3
    Find the y-intercept of y = 4x − 7.
    (1)
    −7, i.e. the point (0 ; −7)✓ (1)
  4. 4
    Find the x-intercept of y = 2x − 6.
    (2)
    Set y = 0: 2x − 6 = 0 → x = 3✓✓ (2)
TOTAL: 6 marks
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