Precalculus: Mathematics for Calculus - 6th Edition
Precalculus: Mathematics for Calculus - 6th Edition
6th Edition
ISBN: 9780840068071
Author: Stewart, James, Redlin, Lothar, Watson, Saleem
Publisher: Cengage Learning
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Chapter 10, Problem 30RE
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To determine

To find: the solution of the system

Expert Solution & Answer
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Answer to Problem 30RE

The solution of the system is (2,1,−1,−1)

Given:

  {x+3z=−1y−4w=52y+z+w=02x+y+5z−4w=4

Explanation:

Let’s begin by labeling our four equations

  {x+3z=−1           Equation 1y−4w=5           Equation 22y+z+w=0           Equation 32x+y+5z−4w=4           Equation 4

Notice that Equation 2 and 4 have the same y− and w−terms .

  2x+y+5z-4w=4         -[y-4w=5]           2x+5z=-1         

Our new system, with the new Equation 4 , is

  {x+3z=−1           Equation 1y−4w=5           Equation 22y+z+w=0           Equation 32x+5z=−1           Equation 4

Now, add Equation 4 and a multiple of Equation 1 in order to eliminate the x−term from Equation 2 .

  2x+5z=−1           −2[x+3z=−1]          

Simplified, this is

  2x+5z=−1           +[−2x−6z=2]           −z=1         

This reduced to

  z=-1

Our new system, with the new Equation 4 , is

  {x+3z=−1           Equation 1y−4w=5           Equation 22y+z+w=0           Equation 3z=−1           Equation 4

Notice that Equation 1 only has x and z−terms , so solve for x using substitution.

  x+3z=−1x+3(−1)=−1x−3=−1x=2

Also rewrite Equation 3 using this value.

  2y+z+w=02y+(−1)+w=02y+w=1

Write the system as

  {x=2           Equation 1y−4w=5           Equation 22y+w=1           Equation 3z=−1           Equation 4

To solve for the last two variables, combine Equation 2 and 3 .

  2y+w=1           −2[y−4w=5]          

Simplified, this is

This reduces to

  w=−1

Place this into Equation 3 .

  2y+w=12y+(−1)=12y=2y=1

The values of all three variables is

  x=2y=1z=−1w=−1

The ordered quadruplet is (2,1,−1,−1)

Conclusion:

Thus, the solution of the system is (2,1,−1,−1)

Explanation of Solution

Given:

  {x+3z=−1y−4w=52y+z+w=02x+y+5z−4w=4

Let’s begin by labeling our four equations

  {x+3z=−1           Equation 1y−4w=5           Equation 22y+z+w=0           Equation 32x+y+5z−4w=4           Equation 4

Notice that Equation 2 and 4 have the same y− and w−terms .

  2x+y+5z-4w=4         -[y-4w=5]           2x+5z=-1         

Our new system, with the new Equation 4 , is

  {x+3z=−1           Equation 1y−4w=5           Equation 22y+z+w=0           Equation 32x+5z=−1           Equation 4

Now, add Equation 4 and a multiple of Equation 1 in order to eliminate the x−term from Equation 2 .

  2x+5z=−1           −2[x+3z=−1]          

Simplified, this is

  2x+5z=−1           +[−2x−6z=2]           −z=1         

This reduced to

  z=-1

Our new system, with the new Equation 4 , is

  {x+3z=−1           Equation 1y−4w=5           Equation 22y+z+w=0           Equation 3z=−1           Equation 4

Notice that Equation 1 only has x and z−terms , so solve for x using substitution.

  x+3z=−1x+3(−1)=−1x−3=−1x=2

Also rewrite Equation 3 using this value.

  2y+z+w=02y+(−1)+w=02y+w=1

Write the system as

  {x=2           Equation 1y−4w=5           Equation 22y+w=1           Equation 3z=−1           Equation 4

To solve for the last two variables, combine Equation 2 and 3 .

  2y+w=1           −2[y−4w=5]          

Simplified, this is

This reduces to

  w=−1

Place this into Equation 3 .

  2y+w=12y+(−1)=12y=2y=1

The values of all three variables is

  x=2y=1z=−1w=−1

The ordered quadruplet is (2,1,−1,−1)

Conclusion:

Thus, the solution of the system is (2,1,−1,−1)

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Chapter 10, Problem 29RE
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Chapter 10, Problem 31RE

Chapter 10 Solutions

Precalculus: Mathematics for Calculus - 6th Edition

Ch. 10.1 - The system of equations {2x+3y=75xy=9 is a system...Ch. 10.1 - Prob. 2ECh. 10.1 - A system of two linear equations in two variables...Ch. 10.1 - The following is a system of two linear equations...Ch. 10.1 - Prob. 5ECh. 10.1 - Prob. 6ECh. 10.1 - Prob. 7ECh. 10.1 - Prob. 8ECh. 10.1 - Prob. 9ECh. 10.1 - Prob. 10E
Ch. 10.1 - Prob. 11ECh. 10.1 - Prob. 12ECh. 10.1 - Prob. 13ECh. 10.1 - Prob. 14ECh. 10.1 - Prob. 15ECh. 10.1 - Prob. 16ECh. 10.1 - Prob. 17ECh. 10.1 - Prob. 18ECh. 10.1 - Prob. 19ECh. 10.1 - Prob. 20ECh. 10.1 - Prob. 21ECh. 10.1 - Prob. 22ECh. 10.1 - Prob. 23ECh. 10.1 - Prob. 24ECh. 10.1 - Prob. 25ECh. 10.1 - Prob. 26ECh. 10.1 - Prob. 27ECh. 10.1 - Prob. 28ECh. 10.1 - Prob. 29ECh. 10.1 - Prob. 30ECh. 10.1 - Prob. 31ECh. 10.1 - Prob. 32ECh. 10.1 - Prob. 33ECh. 10.1 - Prob. 34ECh. 10.1 - Prob. 35ECh. 10.1 - Prob. 36ECh. 10.1 - Prob. 37ECh. 10.1 - Prob. 38ECh. 10.1 - Prob. 39ECh. 10.1 - Prob. 40ECh. 10.1 - Prob. 41ECh. 10.1 - Prob. 42ECh. 10.1 - Prob. 43ECh. 10.1 - Prob. 44ECh. 10.1 - Prob. 45ECh. 10.1 - Prob. 46ECh. 10.1 - Prob. 47ECh. 10.1 - Prob. 48ECh. 10.1 - Prob. 49ECh. 10.1 - Prob. 50ECh. 10.1 - Prob. 51ECh. 10.1 - Prob. 52ECh. 10.1 - Prob. 53ECh. 10.1 - Prob. 54ECh. 10.1 - Prob. 55ECh. 10.1 - Prob. 56ECh. 10.1 - Prob. 57ECh. 10.1 - Prob. 58ECh. 10.1 - Value of Coins A man has 14 coins in his pocket,...Ch. 10.1 - Admission Fees The admission fee at an amusement...Ch. 10.1 - Gas Station A gas station sells regular gas for...Ch. 10.1 - Fruit Stand A fruit stand sells two varieties of...Ch. 10.1 - Airplane Speed A man flies a small airplane from...Ch. 10.1 - Boat Speed A boat on a river travels downstream...Ch. 10.1 - Nutrition A researcher performs an experiment to...Ch. 10.1 - Coffee Blends A customer in a coffee shop...Ch. 10.1 - Mixture Problem A chemist has two large containers...Ch. 10.1 - Mixture Problem A biologist has two brine...Ch. 10.1 - Investments A woman invests a total of 20,000 in...Ch. 10.1 - Investments A man invests his savings in two...Ch. 10.1 - Prob. 71ECh. 10.1 - Prob. 72ECh. 10.1 - Prob. 73ECh. 10.1 - Area of a Triangle Find the area of the triangle...Ch. 10.1 - Prob. 75ECh. 10.2 - These exercises refer to the following system:...Ch. 10.2 - Prob. 2ECh. 10.2 - Prob. 3ECh. 10.2 - Prob. 4ECh. 10.2 - Prob. 5ECh. 10.2 - Prob. 6ECh. 10.2 - Prob. 7ECh. 10.2 - Prob. 8ECh. 10.2 - Prob. 9ECh. 10.2 - 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Prob. 10RCCCh. 10 - Prob. 11RCCCh. 10 - Prob. 12RCCCh. 10 - Prob. 13RCCCh. 10 - Prob. 14RCCCh. 10 - Prob. 15RCCCh. 10 - Prob. 16RCCCh. 10 - Prob. 17RCCCh. 10 - Prob. 18RCCCh. 10 - Prob. 19RCCCh. 10 - Prob. 1RECh. 10 - Prob. 2RECh. 10 - Prob. 3RECh. 10 - Prob. 4RECh. 10 - Prob. 5RECh. 10 - Prob. 6RECh. 10 - Prob. 7RECh. 10 - Prob. 8RECh. 10 - Prob. 9RECh. 10 - Prob. 10RECh. 10 - Prob. 11RECh. 10 - Prob. 12RECh. 10 - Prob. 13RECh. 10 - Prob. 14RECh. 10 - Prob. 15RECh. 10 - Prob. 16RECh. 10 - Prob. 17RECh. 10 - Prob. 18RECh. 10 - Prob. 19RECh. 10 - Prob. 20RECh. 10 - Prob. 21RECh. 10 - Prob. 22RECh. 10 - Prob. 23RECh. 10 - Prob. 24RECh. 10 - Prob. 25RECh. 10 - Prob. 26RECh. 10 - Prob. 27RECh. 10 - Prob. 28RECh. 10 - Prob. 29RECh. 10 - Prob. 30RECh. 10 - Prob. 31RECh. 10 - Prob. 32RECh. 10 - Prob. 33RECh. 10 - Prob. 34RECh. 10 - Prob. 35RECh. 10 - Prob. 36RECh. 10 - Prob. 37RECh. 10 - Prob. 38RECh. 10 - Prob. 39RECh. 10 - Prob. 40RECh. 10 - Prob. 41RECh. 10 - Prob. 42RECh. 10 - Prob. 43RECh. 10 - Prob. 44RECh. 10 - Prob. 45RECh. 10 - Prob. 46RECh. 10 - Prob. 47RECh. 10 - Prob. 48RECh. 10 - Prob. 49RECh. 10 - Prob. 50RECh. 10 - Prob. 51RECh. 10 - Prob. 52RECh. 10 - Prob. 53RECh. 10 - Prob. 54RECh. 10 - Prob. 55RECh. 10 - Prob. 56RECh. 10 - Prob. 57RECh. 10 - Prob. 58RECh. 10 - Prob. 59RECh. 10 - Prob. 60RECh. 10 - Prob. 61RECh. 10 - Prob. 62RECh. 10 - Prob. 63RECh. 10 - Prob. 64RECh. 10 - Prob. 65RECh. 10 - Prob. 66RECh. 10 - Prob. 67RECh. 10 - Prob. 68RECh. 10 - Prob. 69RECh. 10 - Prob. 70RECh. 10 - Prob. 71RECh. 10 - Prob. 72RECh. 10 - Prob. 73RECh. 10 - Prob. 74RECh. 10 - Prob. 75RECh. 10 - Prob. 76RECh. 10 - Prob. 77RECh. 10 - Prob. 78RECh. 10 - Prob. 79RECh. 10 - Prob. 80RECh. 10 - Prob. 81RECh. 10 - Prob. 82RECh. 10 - Prob. 83RECh. 10 - Prob. 84RECh. 10 - Prob. 85RECh. 10 - Prob. 86RECh. 10 - Prob. 87RECh. 10 - Prob. 88RECh. 10 - Prob. 89RECh. 10 - Prob. 90RECh. 10 - Prob. 91RECh. 10 - Prob. 92RECh. 10 - Prob. 93RECh. 10 - Prob. 94RECh. 10 - Prob. 95RECh. 10 - Prob. 96RECh. 10 - Prob. 97RECh. 10 - Prob. 98RECh. 10 - Prob. 99RECh. 10 - Prob. 100RECh. 10 - Prob. 101RECh. 10 - Prob. 102RECh. 10 - Prob. 103RECh. 10 - Prob. 104RECh. 10 - Prob. 105RECh. 10 - Prob. 106RECh. 10 - Prob. 107RECh. 10 - Prob. 108RECh. 10 - Prob. 109RECh. 10 - Prob. 110RECh. 10 - Prob. 111RECh. 10 - Prob. 112RECh. 10 - Prob. 1TCh. 10 - Prob. 2TCh. 10 - Prob. 3TCh. 10 - Prob. 4TCh. 10 - Prob. 5TCh. 10 - Prob. 6TCh. 10 - Prob. 7TCh. 10 - Anne, Barry, and Cathy enter a coffee shop. Anne...Ch. 10 - Prob. 9TCh. 10 - Prob. 10TCh. 10 - Only one of the following matrices has an inverse....Ch. 10 - Prob. 12TCh. 10 - Prob. 13TCh. 10 - Prob. 14TCh. 10 - Find the maximum and minimum values of the given...Ch. 10 - Prob. 2PCh. 10 - Prob. 3PCh. 10 - Find the maximum and minimum value of the given...Ch. 10 - Making Furniture A furniture manufacturer makes...Ch. 10 - A Housing Development A housing contractor has...Ch. 10 - Hauling Fruit A trucker hauls citrus fruit from...Ch. 10 - Manufacturing Calculators A manufacturer of...Ch. 10 - Shipping Televisions An electronics discount chain...Ch. 10 - Prob. 10PCh. 10 - Packaging Nuts A confectioner sells two types of...Ch. 10 - Feeding Lab Rabbits A biologist wishes to feed...Ch. 10 - Investing in Bonds A woman wishes to invest 12,000...Ch. 10 - Prob. 14PCh. 10 - Business Strategy A small software company...Ch. 10 - Feasible Region All parts of this problem refer to...
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