Chapter 3 - Section 3.5 - Equations of Lines - Exercise Set - Page 172: 4

See graph

$3x+y=9$ $y=-3x+9$ Plug in x-values, such as -1, 0, and 1, to find their corresponding y-values. $x=-1$ $y=-3(-1)+9$ $y=12$ $(-1,12)$ $x=0$ $y=-3(0)+9$ $y=9$ $(0,9)$ $x=1$ $y=-3(1)+9$ $y=6$ $(1,6)$ Plot these points on a graph and connect with a straightedge.