### Home > A2C > Chapter 1 > Lesson 1.1.2 > Problem 1-19

Does the temperature outside depend on the time of day, or does the time of day depend on the temperature outside? This may seem like a silly question, but to sketch a graph that represents this relationship, you first need to decide which axis will represent which quantity.

When you graph an equation such as

, which variable (or)*depends*on the other? Which is not dependent? (That is, which is*independent?*) Explain.The

is independent and theis dependent becausedepends on.Which variable is

*dependent*: temperature or time of day? Which variable is*independent*?Reread the questions in the opening paragraph of the problem.

The time of day is independent and the temperature is dependent.

Sketch a graph (with appropriately named axes) that shows the relationship between temperature outside and time of day.

Each day starts at midnight.