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 20 October 2014

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# Algebra: Straight Line Graphs

Straight Line Graphs lesson plan

## KS3 Bitesize

### Objectives

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

• AT2 level

### Resources

• 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?"

#### Activity

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.

#### Extension

• 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

#### Plenary

• 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+?

#### Homework

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