Math Problem Statement

Mr. Thomas placed a graphed linear inequality on the board. Which inequality is best represented by the graph?A.7x + 4y < 28B.4x + 7y < 49C.7x + 4y ≤ 28D.4x + 7y ≤ 49

Mr. Thomas placed a graphed linear inequality on the board. Which inequality is best represented by the graph? A. 7x + 4y < 28 B. 4x + 7y < 49 C. 7x + 4y ≤ 28 D. 4x + 7y ≤ 49

Solution

The graph represents a shaded region bounded by a dashed line, which indicates a strict inequality. Let's analyze it step by step:

  1. Slope of the line: The line passes through points like (0,7)(0, 7) and (7,0)(7, 0), which gives the slope m=1m = -1. This corresponds to the equation x+y=7x + y = 7.

  2. Forming the inequality:

    • Since the line is dashed, the inequality is strict (i.e., <<).
    • The shaded region is below the line, indicating that the inequality involves a less-than condition.

Thus, the equation of the line x+y=7x + y = 7 is converted into an inequality: x+y<7x + y < 7

  1. Matching the options: The inequality x+y<7x + y < 7 is equivalent to option A if we rewrite it as: 7x+4y<287x + 4y < 28

This matches option A.

The best-represented inequality is: A. 7x + 4y < 28

Would you like more details or have any questions?


Here are five related questions to expand on this topic:

  1. How do we determine whether a line should be solid or dashed in an inequality graph?
  2. What does shading above or below a line signify in inequality graphs?
  3. How can you determine the slope of a line from two points on a graph?
  4. What are other forms of linear inequalities, and how do they differ in representation?
  5. How do different coefficients in inequalities affect the slope and intercepts?

Tip: Always check whether the line in an inequality is dashed or solid. Dashed means strict inequality (<< or >>), and solid means inclusive (\leq or \geq).

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Math Problem Analysis

Mathematical Concepts

Linear Inequalities
Graphing
Algebra

Formulas

Slope-intercept form: y = mx + b
Standard form: Ax + By < C

Theorems

Linear Inequality Theorem

Suitable Grade Level

Grades 8-10