don steward
mathematics teaching 10 ~ 16

Friday, 15 November 2013

NRICH interactive straight line graphs

parallel lines

when the blue point is moved the new gradient is shown

 the gradient can go negative

when the red point is moved the line is shifted (translated) up or down

perpendicular lines

the origin is fixed, the other 3 points can be moved to create

parallel lines

perpendicular lines

translating lines

all four points can be moved

students could explore:

or be asked to find pairs of lines that seem to intersect e.g. at the point (-3, 3)

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