Exam 7: Introduction to Linear Programming

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Whenever all the constraints in a linear program are expressed as equalities,the linear program is said to be written in

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A

Maxwell Manufacturing makes two models of felt tip marking pens.Requirements for each lot of pens are given below. Fliptop Model Tiptop Model Available Plastic 3 4 36 Ink Assembly 5 4 40 Molding Time 5 2 30 The profit for either model is $1000 per lot. a.What is the linear programming model for this problem? b.Find the optimal solution. c.Will there be excess capacity in any resource?

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a.Let F = the number of lots of Fliptop pens to produce
Let T = the number of lots of Tiptop pens to produce
 Max 1000F+1000T s.t. 3F+4T365F+4T405F+2T30 F,T0\begin{array} { c r } \text { Max } & 1000 F + 1000 T \\\text { s.t. } & 3 F + 4 T \leq 36 \\& 5 F + 4 T \leq 40 \\& 5 F + 2 T \leq 30 \\&\mathrm {~F} , T \geq 0\end{array} b.  a.Let F = the number of lots of Fliptop pens to produce Let T = the number of lots of Tiptop pens to produce   \begin{array} { c r }  \text { Max } & 1000 F + 1000 T \\ \text { s.t. } & 3 F + 4 T \leq 36 \\ & 5 F + 4 T \leq 40 \\ & 5 F + 2 T \leq 30 \\ &\mathrm {~F} , T \geq 0 \end{array}  b.   The complete optimal solution is F = 2,T = 7.5,s<sub>1</sub> = 0,s<sub>2</sub> = 0,s<sub>3</sub> = 5,obj.func.= 9500 c.There is an excess of 5 units of molding time available. The complete optimal solution is F = 2,T = 7.5,s1 = 0,s2 = 0,s3 = 5,obj.func.= 9500
c.There is an excess of 5 units of molding time available.

The improvement in the value of the objective function per unit increase in a right-hand side is the

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Because the dual price represents the improvement in the value of the optimal solution per unit increase in right-hand-side,a dual price cannot be negative.

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The maximization or minimization of a quantity is the

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Create a linear programming problem with two decision variables and three constraints that will include both a slack and a surplus variable in standard form.Write your problem in standard form.

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Slack

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In a feasible problem,an equal-to constraint cannot be nonbinding.

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Does the following linear programming problem exhibit infeasibility,unboundedness,or alternate optimal solutions? Explain. Min 3x+3y s.t. 1x+2y\leq16 1x+1y\leq10 5x+3y\leq45 x,y\geq0

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A redundant constraint results in

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Find the complete optimal solution to this linear programming problem. Max 2x+3y s.t. 4x+9y\leq72 10x+11y\leq110 17x+9y\leq153 x,y\geq0

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Solve the following system of simultaneous equations. 6x + 2y = 50 2x + 4y = 20

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Increasing the right-hand side of a nonbinding constraint will not cause a change in the optimal solution.

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Explain how to graph the line x1 2x2 0.

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Solve the following system of simultaneous equations. 6x + 4y = 40 2x + 3y = 20

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A linear programming problem can be both unbounded and infeasible.

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A redundant constraint is a binding constraint.

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The constraint 5x1 2x2 0 passes through the point (20,50).

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As long as the slope of the objective function stays between the slopes of the binding constraints

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Which of the following is a valid objective function for a linear programming problem?

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