Chapter 7: Problem 9
In Exercises 5-18, sketch the graph of the inequality. $$y>-7$$
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Chapter 7: Problem 9
In Exercises 5-18, sketch the graph of the inequality. $$y>-7$$
These are the key concepts you need to understand to accurately answer the question.
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Solving a Linear Programming Problem, find the minimum and maximum values of the objective function and where they occur, subject to the indicated constraints. (For each exercise, the graph of the region determined by the constraints is provided.) $$ \begin{array}{c}{\text { Objective function: }} \\ {z=4 x+3 y} \\ {\text { Constraints: }} \\ {x \geq 0} \\ {y \geq 0} \\ {x+y \leq 5}\end{array} $$
Finding Minimum and Maximum Values, find the minimum and maximum values of the objective function and where they occur, subject to the constraints \(x \geq 0, y \geq 0,3 x+y \leq 15\) and \(4 x+3 y \leq 30 .\) $$ z=3 x+y $$
Finance A small corporation borrowed \(\$ 775,000\) to expand its clothing line. Some of the money was borrowed at \(8 \% ,\) some at \(9 \% ,\) and some at 10\(\% .\) How much was borrowed at each rate when the annual interest owed was \(\$ 67,500\) and the amount borrowed at 8\(\%\) was four times the amount borrowed at 10\(\% ?\)
Electrical Network Applying Kirchhoff's Laws to the electrical network in the figure, the currents \(I _ { 1 } , I _ { 2 }\) and \(I _ { 3 }\) are the solution of the system $$\left\\{ \begin{aligned} I _ { 1 } - I _ { 2 } + I _ { 3 } & = 0 \\ 3 I _ { 1 } + 2 I _ { 2 } & = 7 \\ 2 I _ { 2 } + 4 I _ { 3 } & = 8 \end{aligned} \right.$$ Find the currents.
A dietitian designs a special dietary supplement using two different foods. Each ounce of food X contains 20 units of calcium, 15 units of iron, and 10 units of vitamin B. Each ounce of food Y contains 10 units of calcium, 10 units of iron, and 20 units of vitamin B. The minimum daily requirements of the diet are 300 units of calcium, 150 units of iron, and 200 units of vitamin B. (a) Write a system of inequalities describing the different amounts of food X and food Y that can be used. (b) Sketch a graph of the region corresponding to the system in part (a). (c) Find two solutions of the system and interpret their meanings in the context of the problem.
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