Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 1 - Graphs - 1.3 Lines - 1.3 Assess Your Understanding - Page 31: 47

Answer

$y=3x+9$

Work Step by Step

We know that if the slope of a line is $m$ and it contains $P_1(x_1,y_1)$, then its equation is: $y-y_1=m(x-x_1).$ Hence, here: $y-3=3[x-(-2)]\\ y-3=3(x+2)\\ y-3=3x+6\\ y=3x+6+3\\ y=3x+9$
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