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The graph of Fahrenheit temperature, °F, as a function of Celsius temperature, °C, is a line. You know that 212°F and 100°C both represent the temperature at which water boils. Similarly, 32°F and 0°C both represent water's freezing point.

(a) What is the slope of the graph?

(b) What is the equation of the line?

(c) Use the equation to find what Fahrenheit temperature corresponds to 20°C.

(d) What temperature is the same number of degrees in both Celsius and Fahrenheit?

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