5. The graph shows how 2007 prices for mailing letters in Canada vary with mass. Canadian Domestic Letter Prices Price ($) 2.50 2.00 1.50 1.00 0.50 0.00 ↑Y 100 200 300 Mass (g) 400 500 a) Explain why this relation is a function. Why is it important for this to be so? b) State the domain and range of the function.

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Q: Only data that is a function can be graphed in a scatter diagram. O True O False

A: True.