## Thinking Mathematically (6th Edition)

Subtract 1 on both sides to obtain: $x = -1$ RECALL: (1) The graph of $x=h$ where $h$ is a constant is a vertical line whose x-intercept is $h$. (2) The graph of $y=k$ where $k$ is a constant is a horizontal line whose y-intercept is $k$. Thus, the given equation is a vertical line whose x-intercept is $-1$.