Plotting lines from an equation
Objective. Plot a straight line by making a small table of values.
- 1. Learn
- 2. Worked example
- 3. Practice
- 4. Feedback
- 5. Continue
Learn: the key idea
Choose three x-values, substitute to find y, plot and join. Three points let you spot an arithmetic slip.
Worked example
Plot y = 2x − 1 for x = 0, 1, 2.
- 1x = 0 gives y = −1.
- 2x = 1 gives y = 1.
- 3x = 2 gives y = 3. Points: (0,−1), (1,1), (2,3).
Answer: A line through (0, −1) with gradient 2
Concept mastery
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Practice
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Start practisingCommon mistake. Joining only two points and never noticing a mis-plot.
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