Download the PowerPoint here (thanks to MrBriggs on Twitter for pointing out that I forgot to add this link in!)
This lesson went well, actually.
Work out the gradients and try and notice something.
![](https://ticktockmaths.co.uk/wp-content/uploads/2019/10/perp2.png)
Then there’s a little bit on making sure we can properly identify when something is a negative reciprocal.
![](https://ticktockmaths.co.uk/wp-content/uploads/2019/10/perp3.png)
Obviously, an example problem pair.
![](https://ticktockmaths.co.uk/wp-content/uploads/2019/10/perp4.png)
Then some nice questions.
![](https://ticktockmaths.co.uk/wp-content/uploads/2019/10/perp5.png)
![](https://ticktockmaths.co.uk/wp-content/uploads/2019/10/perp6.png)
Quite pleased with this one. Enjoy.
Next lesson : I’m going to re-do my fractions slides and add a load of stuff in.