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Lesson observation for high ability year 10s but I always used it with my year 9 class. The worksheets I used which are mentioned in the Powerpoint are attached.
The activity of investigating whether the lines are parallel, perpendicular or neither to the equation of the line in the middle can be used in two different ways:
You can laminate the boards and students can write the answers in the boxes provided with whiteboard pens
Velcro the cards of parallel/perpendicular/neither and students velcro the answer into the box.
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