Math Problem Statement

Which of the following could be the equation of the graph shown below?

Solution

To determine which equation matches the given graph, let's analyze the line visually.

Step 1: Analyze the slope

The line in the image has a negative slope, as it is slanting downward from left to right. This tells us that the equation of the line must have a negative coefficient for xx if written in the form y=mx+by = mx + b.

Step 2: Analyze the y-intercept

The line crosses the y-axis at a positive point, indicating that the y-intercept bb in the equation y=mx+by = mx + b is positive.

Step 3: Check the options

Let's check the given equations and identify which could represent this line:

  • A. y=4x+2y = -4x + 2: This equation has a negative slope (-4) and a positive y-intercept (2), which matches our analysis. So, Option A could be correct.

  • B. 3x+2y=63x + 2y = 6: Rewriting this equation in slope-intercept form y=mx+by = mx + b, we solve for yy: 2y=3x+6y=32x+32y = -3x + 6 \quad \Rightarrow \quad y = -\frac{3}{2}x + 3 The slope is negative (32)\left( -\frac{3}{2} \right), and the y-intercept is 3, so this could also match the graph. Option B could be correct.

  • C. y=5y = 5: This represents a horizontal line with slope 0, which does not match the graph. Option C is not correct.

  • D. 2xy=72x - y = 7: Rewriting this in slope-intercept form: y=2x+7y=2x7-y = -2x + 7 \quad \Rightarrow \quad y = 2x - 7 This equation has a positive slope, so it does not match the graph. Option D is not correct.

Conclusion:

The equations that match the graph are A and B.

Would you like further details or explanations? Here are 5 follow-up questions:

  1. How do we determine the slope from a graph?
  2. Why does a negative slope indicate a line slanting downward?
  3. What are the general forms of linear equations, and how can we convert between them?
  4. How do y-intercepts help in identifying equations?
  5. Can you explain how to solve for yy from a standard-form linear equation?

Tip: Always check both the slope and y-intercept when matching an equation to a graph.

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Graph Analysis
Slope-Intercept Form

Formulas

Slope-Intercept Form: y = mx + b
Standard Form to Slope-Intercept Form Conversion

Theorems

Equation of a Line

Suitable Grade Level

Grades 9-12