Using the Interactive Graphs
Key features of the graphs may be changed by using the 'Mode' button. Click once on this to set red dots on the feature to be moved. Drag it into position. Then click on 'Mode' once more to return to the graph function. Experiment!
Exercises are accessed using 'pop-up' windows. This window may disappear behind the browser as you are working; to bring it to the front, press and hold the 'Alt' key, and press 'Tab' until the window you want is selected.
Some Graphs You Need To Know About
The Y axis is a vertical line in the centre of the graph. It can be described by the equation x=0. This means that all the points on the line have an x-coordinate of 0.
Some examples: (0, 3), (0, 0), or (0, -7)
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The X axis is a horizontal line in the centre of the graph. It can be described by the equation y=0. This means that all the points on the line have a y-coordinate of 0.
Some examples: (4, 0), (0, 0), or (-6, 0)
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The line y=x is a line at 45 degrees, through the centre. All points on this line have equal x and y coordinates.
Some examples: (-3, -3), (0, 0), or (2, 2)
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