Straight Line Graphs lesson plan
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- To introduce pupils to the concept that certain equations produce straight lines
- AT2 level
- Worksheet straight line graphs
- Pencils, rulers, graph paper
- 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?"
- Pupils draw a set of axes from -10 to 10 on the x axis and -15 to 20 on the y axis.
- Give out worksheet on Straight Line Graphics
- Pupils work individually
- 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