y = mx + c (straight-line equation)

Mark scheme and answers · Total marks: 49

Question 1 [1 mark]

4

Mark scheme
  • A [1] — cao 4

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Question 2 [1 mark]

-12

Mark scheme
  • A [1] — cao -½

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Question 3 [1 mark]

y = -2x + 1

Mark scheme
  • A [1] — cao y = -2x + 1

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Question 4 [1 mark]

(43, 113)

Mark scheme
  • A [1] — cao (4⁄3, 11⁄3)

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Question 5 [1 mark]

4

Mark scheme
  • A [1] — cao 4

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Question 6 [1 mark]

-5

Mark scheme
  • A [1] — cao -5

Accept algebraically equivalent correct forms.

Question 7 [1 mark]

y = 3x + 7

Mark scheme
  • A [1] — cao y = 3x + 7

Accept algebraically equivalent correct forms.

Question 8 [1 mark]

-1

Mark scheme
  • A [1] — cao -1

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Question 9 [1 mark]

-3

Mark scheme
  • A [1] — cao -3

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Question 10 [2 marks]

All points have the same gradient of 1 between consecutive points

Mark scheme
  • A [2] — cao All points have the same gradient of 1 between consecutive points

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Question 11 [1 mark]

3

Mark scheme
  • A [1] — cao 3

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Question 12 [2 marks]

y = -x + 7

Mark scheme
  • A [2] — cao y = -x + 7

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Question 13 [2 marks]

k = 2 or k = 4

Mark scheme
  • A [2] — cao k = 2 or k = 4

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Question 14 [2 marks]

b = 3

Mark scheme
  • A [2] — cao b = 3

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Question 15 [2 marks]

y = 1.5x - 8

Mark scheme
  • A [2] — cao y = 1.5x - 8

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Question 16 [2 marks]

y = 3x + 4

Mark scheme
  • A [2] — cao y = 3x + 4

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Question 17 [2 marks]

y = 3x

Mark scheme
  • A [2] — cao y = 3x

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Question 18 [2 marks]

y = -x + 5

Mark scheme
  • A [2] — cao y = -x + 5

Accept algebraically equivalent correct forms.

Question 19 [2 marks]

2

Mark scheme
  • A [2] — cao 2

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Question 20 [2 marks]

-2

Mark scheme
  • A [2] — cao -2

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Question 21 [1 mark]

y = 12x + 3

Mark scheme
  • A [1] — cao y = ½x + 3

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Question 22 [2 marks]

y = 2x - 1

Mark scheme
  • A [2] — cao y = 2x - 1

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Question 23 [2 marks]

y = -1.5x + 6

Mark scheme
  • A [2] — cao y = -1.5x + 6

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Question 24 [2 marks]

(0, 3)

Mark scheme
  • A [2] — cao (0, 3)

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Question 25 [2 marks]

k = 11, y = x + 1

Mark scheme
  • A [2] — cao k = 11, y = x + 1

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Question 26 [2 marks]

y = -0.2x + 6.8

Mark scheme
  • A [2] — cao y = -0.2x + 6.8

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Question 27 [2 marks]

y = -3x + 20

Mark scheme
  • A [2] — cao y = -3x + 20

Accept algebraically equivalent correct forms.

Question 28 [2 marks]

D(4, 7), y = 0.5x + 5

Mark scheme
  • A [2] — cao D(4, 7), y = 0.5x + 5

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Question 29 [2 marks]

m = 2, c = 5

Mark scheme
  • A [2] — cao m = 2, c = 5

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Question 30 [2 marks]

y = 4x + 5

Mark scheme
  • A [2] — cao y = 4x + 5

Accept algebraically equivalent correct forms.

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