Math Problem Statement

Daerah penyelesaian dari sistem pertidaksamaan linear berikut adalah: x + 2y ≥ 6, x + y ≤ 8, x ≥ 0, y ≥ 0.

Solution

This problem involves solving a system of linear inequalities. The inequalities given are:

  1. x+2y6x + 2y \geq 6
  2. x+y8x + y \leq 8
  3. x0x \geq 0 (ensuring xx is non-negative)
  4. y0y \geq 0 (ensuring yy is non-negative)

Steps to Find the Solution Region:

  1. Graph the inequalities:

    • For x+2y6x + 2y \geq 6: The boundary line is x+2y=6x + 2y = 6. Solve for yy: y=6x2y = \frac{6 - x}{2} This is a straight line with intercepts (0,3)(0, 3) and (6,0)(6, 0). The region x+2y6x + 2y \geq 6 lies above this line.
    • For x+y8x + y \leq 8: The boundary line is x+y=8x + y = 8. Solve for yy: y=8xy = 8 - x This is a straight line with intercepts (0,8)(0, 8) and (8,0)(8, 0). The region x+y8x + y \leq 8 lies below this line.
    • For x0x \geq 0 and y0y \geq 0: These are constraints limiting the region to the first quadrant.
  2. Identify the feasible region: The solution to the system of inequalities is the intersection of the regions defined by the inequalities. The region must satisfy:

    • Above x+2y=6x + 2y = 6
    • Below x+y=8x + y = 8
    • In the first quadrant (x0,y0x \geq 0, y \geq 0).
  3. Find intersection points:

    • Intersection of x+2y=6x + 2y = 6 and x+y=8x + y = 8: Solve the system: x+2y=6x + 2y = 6 x+y=8x + y = 8 Subtract the second equation from the first

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Math Problem Analysis

Mathematical Concepts

Linear Inequalities
Graphing Systems of Inequalities
Coordinate Geometry

Formulas

Equation of a straight line: y = mx + c
Solving systems of linear equations

Theorems

Intersection of inequalities defines the feasible region

Suitable Grade Level

Grades 9-11