## Calculus with Applications (10th Edition)

$x+3y=0$ $3y=-x$ $y=-\displaystyle \frac{1}{3}x$ The y intercept is 0 (the line passes through the origin) One more point needed (two points determine a line). When x=$3$, y=$-\displaystyle \frac{1}{3}\cdot 3=-1$ So, another point on the line is ($3,-1$). Plot the two points and draw a straight line through them