Unit 9 - Lesson 4 - Grade 8: Illustrative Mathematics

Make a list of different factors.

Write a sentence for each factor describing how changing it could change the temperature.Example: One factor is time of day. Often, after sunrise, the temperature increases, reaches a peak in the early afternoon, and then decreases.

Andre and Lin are wondering if temperature is a function of latitude.Andre says, “I think it is, as long as we fix the time when we are measuring the temperature.”Lin says, “But what if you have two places with the same latitude? Look at this weather map for Washington State. Seattle and Spokane have the same latitude but different temperaturesright now.”What do Andre and Lin mean?

Andre and Lin are discussing whether it is possible to define latitude and temperature in a way that makes sense to talk about temperature as a function of latitude. They are consideringdifferent options. Here are the options:a. Finding the temperature right now in cities with different latitudes.b. Finding the daily high temperature in cities that have different latitudes.c. Finding the average high temperature in a specific month, for example, September in cities that have different latitudes.d. Finding the average yearly temperature in cities that have have different latitudes.What are some advantages and disadvantages of each option?

What information could they gather to determine whether temperature is related to latitude?

What should they do with that information to answer the question?