The graph \( A B \) shown in figure is a plot of temperature of a body in degree celsius and deg...

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The graph \( A B \) shown in figure is a plot of temperature of a body in degree celsius and degree Fahrenheit. Then
(a) Slope of line \( A B \) is \( 9 / 5 \)
(b) Slope of line \( A B \) is \( 5 / 9 \)
(c) Slope of line \( A B \) is \( 1 / 9 \)
(d) Slope of line \( A B \) is \( 3 / 9 \)
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