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
Solution
The graph represents a shaded region bounded by a dashed line, which indicates a strict inequality. Let's analyze it step by step:
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Slope of the line: The line passes through points like and , which gives the slope . This corresponds to the equation .
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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 is converted into an inequality:
- Matching the options: The inequality is equivalent to option A if we rewrite it as:
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:
- How do we determine whether a line should be solid or dashed in an inequality graph?
- What does shading above or below a line signify in inequality graphs?
- How can you determine the slope of a line from two points on a graph?
- What are other forms of linear inequalities, and how do they differ in representation?
- 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 ( or ).
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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
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