Big Ideas Math - Algebra 1, A Common Core Curriculum

Published by Big Ideas Learning LLC
ISBN 10: 978-1-60840-838-2
ISBN 13: 978-1-60840-838-2

Chapter 4 - Writing Linear Functions - 4.1-4.3 - Quiz - Page 194: 9

Answer

The linear function is $f(x)=5x+13$.

Work Step by Step

Rewrite as shown below. $f(-3)=-2$ as $(-3,-2)$ and $f(-2)=3$ as $(-2,3)$ Let $(x_1,y_1)=(-3,-2)$ and $(x_2,y_2)=(-2,3)$. Slope $\Rightarrow m =\frac{y_2-y_1}{x_2-x_1}$ Substitute all the values. $\Rightarrow m =\frac{3-(-2)}{-2-(-3)}$ Simplify. $\Rightarrow m =\frac{3+2}{-2+3}$ $\Rightarrow m =\frac{5}{1}$ $\Rightarrow m =5$ The point-slope form. $\Rightarrow y-y_1=m(x-x_1)$ Substitute all the values. $\Rightarrow y-(-2)=5(x-(-3))$ Simplify. $\Rightarrow y+2=5(x+3)$ $\Rightarrow y+2=5x+15$ Subtract $2$ from each side. $\Rightarrow y+2-2=5x+15-2$ Simplify. $\Rightarrow y=5x+13$ Hence, the linear function is $f(x)=5x+13$.
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