Math Problem Statement

  1. Solve the following L.P.P. graphically Min Z = 6x + 2y Such that x + 2y 30 x + 2y 120 2x + y 40 x 0, y .

Solution

It seems like the inequality symbols in the constraints are missing. From the context, I will assume the constraints should look something like this:

Minimize Z=6x+2y\text{Minimize } Z = 6x + 2y Subject to:\text{Subject to:}

  1. x+2y30x + 2y \geq 30
  2. x+2y120x + 2y \leq 120
  3. 2x+y402x + y \leq 40
  4. x0x \geq 0, y0y \geq 0

Let's proceed to solve this Linear Programming Problem (LPP) graphically.

Steps to solve graphically:

  1. Plot the lines for the constraints:

    • For x+2y=30x + 2y = 30 and x+2y=120x + 2y = 120, find the points of intersection with the axes.
    • For 2x+y=402x + y = 40, find the points of intersection with the axes.
  2. Shade the feasible region:

    • Identify the region that satisfies all the inequalities.
  3. Identify the corner points:

    • The feasible region will have corner points where the lines intersect.
  4. Evaluate the objective function:

    • Substitute the corner points into Z=6x+2yZ = 6x + 2y to find the minimum value.

I'll walk you through the solution and plot it graphically. Let's begin by solving for the points where the lines intersect the axes.

Step 1: Find the intercepts

For x+2y=30x + 2y = 30:

  • When x=0x = 0, 2y=302y = 30y=15y = 15.
  • When y=0y = 0, x=30x = 30.

Thus, the intercepts are (30,0)(30, 0) and (0,15)(0, 15).

For x+2y=120x + 2y = 120:

  • When x=0x = 0, 2y=1202y = 120y=60y = 60.
  • When y=0y = 0, x=120x = 120.

Thus, the intercepts are (120,0)(120, 0) and (0,60)(0, 60).

For 2x+y=402x + y = 40:

  • When x=0x = 0, y=40y = 40.
  • When y=0y = 0, 2x=402x = 40x=20x = 20.

Thus, the intercepts are (20,0)(20, 0) and (0,40)(0, 40).

Step 2: Plot the lines and identify the feasible region

Now we will plot these lines on a graph and find the feasible region that satisfies all the constraints.

Let me plot this graphically.

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Math Problem Analysis

Mathematical Concepts

Linear Programming
Graphical Method
Optimization

Formulas

Objective function: Z = 6x + 2y
Constraint equations: x + 2y = 30, x + 2y = 120, 2x + y = 40

Theorems

Fundamental theorem of linear programming: the optimal solution to a linear programming problem occurs at a vertex (or corner point) of the feasible region.

Suitable Grade Level

Grades 10-12