Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 1 - Mid-Chapter Check Point - Page 229: 41

Answer

The function with slope $-2$ and passing through the point $\left( -4,\ 3 \right)$ is $y=-2x-5$.

Work Step by Step

The equation of the line is $y-{{y}_{1}}=m\left( x-{{x}_{1}} \right)$. Here, the point $\left( {{x}_{1}},\ {{y}_{1}} \right)=\left( -4,\ 3 \right)$ and slope $m=-2$. So, plugging in the values of $\left( {{x}_{1}},\ {{y}_{1}} \right)$ and m, we get $\begin{align} & y-{{y}_{1}}=m\left( x-{{x}_{1}} \right) \\ & y-3=\left( -2 \right)\left( x-\left( -4 \right) \right) \\ & y=-2x-8+3 \\ & =-2x-5 \end{align}$
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