Chapter 4.3, Problem 21E

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7th Edition

Stefan Waner + 1 other

ISBN: 9781337274203

Textbook Problem

**Internet Audience** At the end of 2003 the four companies with the largest number of home Internet users in the United States were **Microsoft**, **Time Warner**, **Yahoo**, and **Google**, with a combined audience of 284 million users.^{19} Taking *x* to be the Microsoft audience in millions, *y* the Time Warner audience in millions, *z* the Yahoo audience in millions, and *u* the Google audience in millions, it was observed that

How large was the audience of each of the four companies in November 2003?

To determine

**To calculate:** The audience of Microsoft, Time Warner, Yahoo and Google, if the total audience of all the four is

Explanation

**Given information:**

Total audience of Microsoft, Time Warner, Yahoo and Google is

**Calculation:**

Letās consider the audience for Microsoft as

As per given information:

The equations are:

Again, as the total audience is

Therefore,

The given equations can be written as:

The augmented matrix of the system of above equations is,

Use Ti-83 to reduce the above matrix in row echelon form:

Step1: Press ON key.

Step2: Press

Sect-4.1 P-1ESect-4.1 P-2ESect-4.1 P-3ESect-4.1 P-4ESect-4.1 P-5ESect-4.1 P-6ESect-4.1 P-7ESect-4.1 P-8ESect-4.1 P-9ESect-4.1 P-10E

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