## Intermediate Algebra (12th Edition)

Horizontal lines have the form: $y=c$ (where $c$ is a constant) Vertical lines have the form: $x=c$ (where $c$ is a constant) We try to convert each equation to a horizontal or vertical line: A. $x-6=0\rightarrow x=6$ (vertical line) B. $x+y=0\rightarrow y=-x$ (diagonal line with slope -1) C. $y+3=0\rightarrow y=-3$ (horizontal line) D. $y=-10$ (horizontal line) E. $x+1=5\rightarrow x=4$ (vertical line)