Answer
$(7,21)$
Work Step by Step
The solution to Exercise 131 was $7$. On the given graph, the $x$-value $7$ corresponds with the $y$-value $21$.
$N=\frac{x^2-x}{2}$
$N=\frac{42}{2}$
$N=21$
$(7,21)$
College Algebra (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-32178-228-3
ISBN 13:
978-0-32178-228-1
Chapter 1 - Equations and Inequalities - Exercise Set 1.5 - Page 162: 133
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