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20 October 2014
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Algebra: Straight Line Graphs

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Straight Line Graphs lesson plan

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KS3 Bitesize


  • To introduce pupils to the concept that certain equations produce straight lines

Bitesize English fish

National Curriculum

  • AT2 level


  • Worksheet straight line graphs
  • Pencils, rulers, graph paper

Teaching activities

Mental Starter

  • Mental questions on number bonds, e.g. "Give me two numbers that add up to 10, 15, 20."
  • Mental questions on multiplication tables, e.g. "What is 7 multiplied by 6?"
  • Mental questions, e.g. "Give me a co-ordinate that follows the rule y is double x?"


  1. Pupils draw a set of axes from -10 to 10 on the x axis and -15 to 20 on the y axis.
  2. Give out worksheet on Straight Line Graphics
  3. Pupils work individually
  4. When the pupils have found the co-ordinates, they should draw the lines onto the graph paper, taking care to label each line.


  • Give pupils an investigation on y=mx+c. This could be done on a graph-drawing package or by hand.

    Y=2x+3, y=2x+5, y=2x-6

    Y=3x+4, y=4x+4, y=5x+4

  • Plotting in three dimensions


  • What have pupils found out about the direction of lines y=3, y=7, y=8 (You may need to quickly get the pupils to draw this on the board).
  • Then x=2, x=6, x=-3.
  • Finally x+y=? and y=x+?


  • Give the pupils 5 related graphs to draw so that in the next lesson you can start to look at y=mx+c

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