Mathematics Teaching, March 1st, 2006
I was working with my Y8 class this week on straight line graphs. I was asking pupils to invent examples of equations that would give straight line graphs and say how they would look. To check, I was entering them into a graph-plotting program so we could see on the screen if they were right. To be honest it was getting a little dull.
Then as I tried to type y - x I accidentally bumped the x key again and got y - xx and before I'd noticed I'd pressed enter and a parabola appeared on the screen. Suddenly everyone woke up! I said something like "Oops, made a mistake there" and quickly deleted t...
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