Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 3 - Introduction to Graphing - 3.6 Slope-Intercept Form - 3.6 Exercise Set - Page 210: 82


250 words

Work Step by Step

Represent the unknown: Let $x$=the number of words he has written Since he still has to write three times as many words as he has written, then he still has to write $\color{blue}{\bf{3x}}$ words. The total number of words is 1000, thus, $x+ 3x = 1000 \\4x=1000 \\\frac{4x}{4}=\frac{1000}{4} \\x=250$ Therefore, he has written 250 words already.
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