Math Problem Statement

​(c)**** What is the graph of the equation that represents the relationship between​ driven, D, and gas​ used, G?

A.

100202500500Gas (gal)Distance (mi)

A coordinate system has a horizontal axis Gas (gallons) labeled from 0 to 20 in increments of 2 and a vertical axis Distance (miles) labeled from 0 to 500 in increments of 50. A line starts at the origin (0, 0) and rises from left to right passing through (20, 200).

B.

100202500500Gas (gal)Distance (mi)

A coordinate system has a horizontal axis Gas (gallons) labeled from 0 to 20 in increments of 2 and a vertical axis Distance (miles) labeled from 0 to 500 in increments of 50. A line starts at the origin (0, 0) and rises from left to right passing through (10, 300).

C.

100202500500Gas (gal)Distance (mi)

A coordinate system has a horizontal axis Gas (gallons) labeled from 0 to 20 in increments of 2 and a vertical axis Distance (miles) labeled from 0 to 500 in increments of 50. A line starts at the origin (0, 0) and rises from left to right passing through the approximate point (1, 300).

D.

100202500500Gas (gal)Distance (mi)

Solution

To determine the graph that represents the relationship between the distance driven (DD) and gas used (GG), analyze the proportional relationship indicated by the given points on each option's graph.

Step-by-Step Analysis:

  1. The graph represents a linear relationship D=mGD = mG, where:

    • mm is the slope (distance per gallon of gas).
  2. For each graph option, calculate the slope mm:

    • Option A: Passes through (20, 200).
      Slope m=DistanceGas=20020=10miles per gallonm = \frac{\text{Distance}}{\text{Gas}} = \frac{200}{20} = 10 \, \text{miles per gallon}.

    • Option B: Passes through (10, 300).
      Slope m=DistanceGas=30010=30miles per gallonm = \frac{\text{Distance}}{\text{Gas}} = \frac{300}{10} = 30 \, \text{miles per gallon}.

    • Option C: Passes through approximately (1, 300).
      Slope m=DistanceGas=3001=300miles per gallonm = \frac{\text{Distance}}{\text{Gas}} = \frac{300}{1} = 300 \, \text{miles per gallon}.

    • Option D: Data missing; cannot analyze.

Key Observations:

  • The relationship between distance (DD) and gas (GG) is realistic if the slope is constant and reasonable (e.g., around 10–30 miles per gallon for typical vehicles).
  • Option B seems realistic, with a slope of 3030 miles per gallon, which is typical for an efficient vehicle.

Conclusion:

The graph in Option B best represents the relationship between distance (DD) and gas used (GG), as the slope indicates an efficient but realistic fuel consumption rate.


Would you like to go over how to calculate slopes or interpret linear graphs in greater detail?
Here are 5 related questions you might explore:

  1. How do you derive the equation of a line from two points?
  2. How does the slope of a line relate to real-world rates like speed or efficiency?
  3. What are some other examples of linear relationships in everyday life?
  4. How can you identify proportional relationships from a graph?
  5. How does changing the slope affect the appearance of a graph?

Tip: When analyzing graphs, always confirm key points like the origin and labeled values to ensure proper interpretation!

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Graphing
Proportional Relationships

Formulas

D = mG (where m is the slope, representing miles per gallon)

Theorems

Slope-Intercept Form of a Line (y = mx + b)

Suitable Grade Level

Grades 7-9