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 3 - Graphing Linear Functions - 3.5 - Graphing Linear Equations in Slope-Intercept Form - Monitoring Progress - Page 139: 11

Answer

$x-$ intercept is $6$. The graph is shown below.

Work Step by Step

The given equation is $\Rightarrow x+2y=6$ Subtract $x$ from each side. $\Rightarrow x+2y-x=6-x$ Simplify. $\Rightarrow 2y=-x+6$ Divide each side by $2$. $\Rightarrow \frac{2y}{2}=\frac{-x+6}{2}$ Simplify. $\Rightarrow y=-\frac{1}{2}x+3$ The slope-intercept form is $\Rightarrow y=mx+b$ $y-$intercept is $b=3$. Plot the $y-$ intercept $A=(0,3)$. The slope is $m=-\frac{1}{2}$ and Slope $m=\frac{rise}{run}=\frac{-1}{2}$ The next point is $2$ unit right and $1$ unit down from the point $(0,3)$. Plot the point $B=(2,2)$. Draw a line through the two points. From the graph the line crosses the $x-$ axis at $C=(6,0)$. Hence, the $x-$ intercept is $6$.
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