4MA1/2FR Jun 2019, Question 26: Finding the Equation From a Graph
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2FR (Foundation) · Calculator · 3 marks
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The question, in short
A straight line L is shown on a grid with x from −4 to 3 and y from −4 to 4, passing through (0, −1), (−1, 1) and (1, −3). Find an equation for L.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Solution · 3 marks
- 1L crosses the y-axis at (0, −1), so c = −1
- 2From (0, −1) to (1, −3): down 2 for 1 across, so gradient = −2
- 3y = −2x − 1
Answery = −2x − 1
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