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Graphs Tell a Story What story does this graph tell?

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W hat story does this graph tell? – Without Labels and units, it is difficult to know the story…. Water Depth inches Time minutes

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It is also important to include a title to specifically describe what the data pertains to. Water Depth inches Time minutes Water level in a bathtub

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Your turn….. Draw a graph of an event, and describe the event with words (write a story). Include labels, units, and a title with your graph.

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Shapes of graphs. In nature, there are only a few basic graph shapes that describe many phenomenon such as gravity, light intensities, growth and decay rates, etc. In this class, we will focus on four of these shapes of graphs. In science, the objective of a graph is often to describe the relationship between the independent and dependent variables. The relation between variables can be stated as an equation… The equation of the graphed line.

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If the graph is not yet a line (linear), but is one of the simple shapes we will soon see, the graph can usually be made into a line by raising the independent variable ( the x-axis) to a power.

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The Linear Graph

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The Graph of a Square Or graph of the independent variable raised to a power.

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The Graph of a Square Root

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The Graph of an Inverse relation Or graph of the independent x-axis raised to the -1 power.

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Determine the relation which the given data describes. XY1 24 39 417 526 636 750

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