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This problem follows on from Parallel Lines
Alter the positions of the lines by moving the points.
Position the lines so that they are perpendicular to each other.
Try various arrangements.
What can you say about the equations of perpendicular lines?
Four vehicles travelled on a road. What can you deduce from the times that they met?
Change one equation in this pair of simultaneous equations very slightly and there is a big change in the solution. Why?
What is the area of the triangle formed by these three lines?