(i.e lines that are: vertical, horizontal, parallel to y = x and parallel to y = -x)
into negative quadrants
this work can usefully introduce or reinforce the procedure for subtracting a negative (the 'geometrical/algebraic imperative' as Hans Freudenthal calls it)
students find a 4th coordinate to complete 4-in-a-line
and then try to find a rule for the lines
these rules only involve gradients of plus 1 and minus 1
the powerpoint is here
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