Problem

It is estimated that \( y \), the number of items of a particular commodity (in millions) sold in the United States in year \( \mathrm{x} \), where \( \mathrm{x} \) represents the number of years since 1990 , is given by the formula \( y=1.23 x+4.5 \). That is, \( x=0 \) represents \( 1990, x=1 \) represents 1991, and so on. According to the formula, how many items sold in \( 1996 ? \)
13.11 millions
4.5 millions
11.88 millions
34.38 millions

Answer

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Answer

\( y = 11.88 \)

Steps

Step 1 ：\( x = 1996 - 1990 \)

Step 2 ：\( x = 6 \)

Step 3 ：\( y = 1.23(6) + 4.5 \)

Step 4 ：\( y = 7.38 + 4.5 \)

Step 5 ：\( y = 11.88 \)

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