This article describes a practical approach to enhance the teaching
and learning of coordinates.
Investigate what happens to the equations of different lines when
you reflect them in one of the axes. Try to predict what will
happen. Explain your findings.
I took the graph y=4x+7 and performed four transformations. Can you
find the order in which I could have carried out the
Investigate what happens to the equation of different lines when
you translate them. Try to predict what will happen. Explain your
Collect as many diamonds as you can by drawing three straight
Explore the relationship between simple linear functions and their
Charlie has created a mapping. Can you figure out what it does?
What questions does it prompt you to ask?
How does the position of the line affect the equation of the line?
What can you say about the equations of parallel lines?
Alf Coles writes about how he tries to create 'spaces for
exploration' for the students in his classrooms.
Position the lines so that they are perpendicular to each other.
What can you say about the equations of perpendicular lines?