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Parallel Lines

How does the position of the line affect the equation of the line? What can you say about the equations of parallel lines?

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Perpendicular Lines

Position the lines so that they are perpendicular to each other. What can you say about the equations of perpendicular lines?

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Graphical Triangle

Weekly Problem 35 - 2007
What is the area of the triangle formed by these three lines?

Enclosing Squares

Stage: 3 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3
Between two points find out how muchyou go across and how much you go up.

From these two distances you can find the gradient and the length of the line segment between the points.