3. What is the y-intercept of the line?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter1: Variables, Expressions, And Integers
Section1.8: The Coordinate Plane
Problem 7E
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**Understanding Graphs: Interpreting the Y-Intercept**

**Graph Description:**

The graph displays a red line showing the relationship between time (in minutes) and temperature (in Fahrenheit). The x-axis represents time in minutes, ranging from 0 to 6 minutes. The y-axis represents temperature in Fahrenheit, ranging from 0 to 300 Fahrenheit.

The red line starts at the point (0, 50) on the graph, indicating the initial temperature at 0 minutes is 50°F. As time increases, the temperature also increases in a linear fashion. At 2 minutes, the temperature is 150°F, and at 4 minutes the temperature reaches 250°F.

**Question:**

3. What is the y-intercept of the line?

**Explanation:**

The y-intercept of a line is the point where the line crosses the y-axis. This occurs when the value of x is 0. On the given graph, the red line crosses the y-axis at 50°F. Therefore, the y-intercept of the line is 50.

**Conclusion:**

Understanding the y-intercept is critical as it provides the starting value of the dependent variable (temperature) when the independent variable (time) is zero. In this example, at time 0 minutes, the temperature is already 50°F. This concept is fundamental in interpreting linear relationships in various scientific and mathematical contexts.
Transcribed Image Text:**Understanding Graphs: Interpreting the Y-Intercept** **Graph Description:** The graph displays a red line showing the relationship between time (in minutes) and temperature (in Fahrenheit). The x-axis represents time in minutes, ranging from 0 to 6 minutes. The y-axis represents temperature in Fahrenheit, ranging from 0 to 300 Fahrenheit. The red line starts at the point (0, 50) on the graph, indicating the initial temperature at 0 minutes is 50°F. As time increases, the temperature also increases in a linear fashion. At 2 minutes, the temperature is 150°F, and at 4 minutes the temperature reaches 250°F. **Question:** 3. What is the y-intercept of the line? **Explanation:** The y-intercept of a line is the point where the line crosses the y-axis. This occurs when the value of x is 0. On the given graph, the red line crosses the y-axis at 50°F. Therefore, the y-intercept of the line is 50. **Conclusion:** Understanding the y-intercept is critical as it provides the starting value of the dependent variable (temperature) when the independent variable (time) is zero. In this example, at time 0 minutes, the temperature is already 50°F. This concept is fundamental in interpreting linear relationships in various scientific and mathematical contexts.
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