Real World Applications – Algebra I
How do we convert the temperature?
In different countries all around the world, people define the temperature in two different ways. There are two different sets of scales that people use: degrees in Celsius and Fahrenheit. In the United States, all of the temperature readings are in Fahrenheit. What if you were to go to a different country? How can you convert the temperature to units that you can understand?
On one summer day in Puerto Rico, the temperature read 34 degrees Celsius. If you’re visiting from the United States and not used to the Celsius reading, what does this mean to you? Let’s use the formula to convert to Fahrenheit.
So, if the temperature in Puerto Rico is 34 degrees Celsius, it’s 93.2 degrees Fahrenheit! That’s pretty hot!
If the weather in New York on a cold winter morning is 20 degrees Fahrenheit, how can you explain the temperature to someone that isn’t aware of the temperature in Fahrenheit? Let’s use the formula.
Try doing the same to find the equivalent to 0 degrees Celsius. What did you get? Which equation would you use?
You can actually use either equation. You should get the same answer. Since we’ve been working with the second formula, let’s use that one to find the equivalent to 0 degrees Celsius.
This means that 32 degrees Fahrenheit means the same thing as 0 degrees Celsius.
How would we get either formula in standard form and then use the cover-up method to find the intercepts? What would these intercepts mean?
First, we’ll multiply every term by 5, since we can get rid of the fraction.