Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 2 - Functions, Equations, and Graphs - 2-4 More About Linear Equations - Practice and Problem-Solving Exercises - Page 86: 17

Answer

$y=\dfrac{5}{4}(x-1)$

Work Step by Step

Recall: (1) The slope $m$ of a line through the points $(x_1, y_1)$ and $(x_2, y_2)$ is given by the formula: $$m=\dfrac{y_2-y_1}{x_2-x_1}$$ (2) The equation of a line whose slope is $m$ and passes through the point $(x_1, y_1)$ is: $$y-y_1=m(x-x_1)$$ Solve for the slope using the formula in (1) above: \begin{align*} m&=\dfrac{5-0}{5-1}\\\\ &=\dfrac{5}{4}\\\\ \end{align*} The line has $m=\dfrac{5}{4}$ and passes through $(1, 0)$. Use the point-slope formula in (2) above to obtain the equation of the line: \begin{align*} y-0&=\frac{5}{4}(x-1)\\\\ y&=\frac{5}{4}(x-1) \end{align*}
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