Challenge The value of a baseball player's rookie card began to increase once the player retired. When he retired in 2000 his card was worth $4.73. The value has increased by $1.43 each year
since then. Express the relationship relating the value of the card y in dollars and the number of
years x the player has been in retirement with an equation. Is the relationship between x and y
proportional? What was the value of the card in 2007?
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