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HomeCIE IGCSE MathematicsGraphs: Equation of a straight line (y = mx + c) and parallel/perpendicular lines
CIE · IGCSE · Mathematics

Graphs: Equation of a straight line (y = mx + c) and parallel/perpendicular lines
Practice Questions

20 CIE IGCSE Mathematics questions on Graphs: Equation of a straight line (y = mx + c) and parallel/perpendicular lines, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Graphs: Equation of a straight line (y = mx + c) and parallel/perpendicular lines

Question 1 · 1 mark · Difficulty 1/3

A straight line has equation y = 3x - 7. What is the gradient of this line?

  1. 3
  2. -7
  3. 7
  4. -3
Show answer & explanation
✓ Answer: A3
Award 1 mark for identifying the gradient as the coefficient of x in the form y = mx + c. B is incorrect — this is the y-intercept (with sign). C is incorrect — this ignores the negative sign of the y-intercept. D is incorrect — this confuses the gradient with a negative value.
Question 2 · 1 mark · Difficulty 2/3

A researcher in Singapore is studying the relationship between altitude, h metres, and temperature, T °C. The relationship is modelled by T = -0.006h + 28. At what altitude does the model predict a temperature of 10 °C?

  1. 3000 m
  2. 2500 m
  3. 1667 m
  4. 3333 m
Show answer & explanation
✓ Answer: A3000 m
Award 1 mark for substituting T = 10 and solving: 10 = -0.006h + 28, so -18 = -0.006h, giving h = 3000. B is incorrect — this uses incorrect rearrangement. C is incorrect — this divides by -0.006 incorrectly. D is incorrect — this adds rather than subtracts.
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20 questions · 25 min · free

CIE IGCSE Mathematics: Graphs: Equation of a straight line (y = mx + c) and parallel/perpendicular lines FAQ

How many CIE IGCSE Mathematics questions on Graphs: Equation of a straight line (y = mx + c) and parallel/perpendicular lines are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Graphs: Equation of a straight line (y = mx + c) and parallel/perpendicular lines for CIE IGCSE Mathematics, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CIE paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CIE IGCSE students preparing for Mathematics?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Graphs: Equation of a straight line (y = mx + c) and parallel/perpendicular lines practice with other Mathematics topics or even switch to a totally different CIE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Graphs: Equation of a straight line (y = mx + c) and parallel/perpendicular lines questions aligned to the official CIE IGCSE Mathematics syllabus?
Every question is written against the published CIE IGCSE Mathematics specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CIE.
How is Graphs: Equation of a straight line (y = mx + c) and parallel/perpendicular lines typically tested on CIE IGCSE Mathematics papers?
Graphs: Equation of a straight line (y = mx + c) and parallel/perpendicular lines appears across multiple question types on real CIE IGCSE Mathematics papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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