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| ⓐ Find the Fahrenheit temperature for a Celsius temperature of 0. Find F when C=0. Simplify. |
F=59C+32F=59(0)+32F=32 |
| ⓑ Find the Fahrenheit temperature for a Celsius temperature of 20. Find F when C=20. Simplify. Simplify. |
F=59C+32F=59(20)+32F=36+32F=68 |
ⓒ Interpret the slope and F-intercept of the equation.
Even though this equation uses Fand C, it is still in slope–intercept form.

The slope, 59, means that the temperature Fahrenheit (F) increases 9 degrees when the temperature Celsius (C) increases 5 degrees.
The F-intercept means that when the temperature is 0∘ on the Celsius scale, it is 32∘ on the Fahrenheit scale.
ⓓ Graph the equation.
We’ll need to use a larger scale than our usual. Start at the F-intercept (0,32) then count out the rise of 9 and the run of 5 to get a second point. See (the referenced figure).
