Math Problem Statement

based off this answer this

Create a system to determine how much money you need and how to allocate work hours between two jobs to meet your monthly expenses. Constraints include income and total work hours per month.

Solution

Here’s the step-by-step breakdown of solving the given task:

Problem Recap:

  • Total income needed: $1,475 per month
  • Work-hour constraints: A maximum of 172 hours per month
  • Two jobs:
    • Job 1 pays $8.25/hour → work xx hours.
    • Job 2 pays $9.00/hour → work yy hours.

Step 1: Write the inequalities

  1. Total hours worked constraint: x+y172x + y \leq 172 (You cannot work more than 172 hours in a month.)

  2. Income constraint: 8.25x+9.00y14758.25x + 9.00y \geq 1475 (You must earn at least $1,475.)


Step 2: Graph the inequalities

Coordinate system:

  • xx: hours worked at $8.25/hour.
  • yy: hours worked at $9.00/hour.

Steps to graph:

  1. Plot the boundary line for x+y=172x + y = 172:

    • When x=0x = 0, y=172y = 172 (point: (0,172)(0, 172)).
    • When y=0y = 0, x=172x = 172 (point: (172,0)(172, 0)).
  2. Plot the boundary line for 8.25x+9y=14758.25x + 9y = 1475:

    • When x=0x = 0, y=14759163.89y = \frac{1475}{9} \approx 163.89 (point: (0,163.89)(0, 163.89)).
    • When y=0y = 0, x=14758.25178.79x = \frac{1475}{8.25} \approx 178.79 (point: (178.79,0)(178.79, 0)).
  3. Shade:

    • For x+y172x + y \leq 172, shade below the line x+y=172x + y = 172.
    • For 8.25x+9y14758.25x + 9y \geq 1475, shade above the line 8.25x+9y=14758.25x + 9y = 1475.
  4. Identify the feasible region: It is the overlapping shaded area satisfying both constraints.


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Math Problem Analysis

Mathematical Concepts

Linear Inequalities
Systems of Equations
Graphing Inequalities

Formulas

x + y ≤ 172 (maximum total work hours)
8.25x + 9.00y ≥ 1475 (minimum income requirement)

Theorems

Linear Inequality Theorem
Intersection of Constraints in Graphing

Suitable Grade Level

Grades 9-11