The line y=-1 is an horizontal line that passes through (0,-1).
The line x=-1 is a vertical line that passes through (-1,0).
To graph the line y=1/2x, we can find some of the points that are on it:
![\begin{gathered} y=(1)/(2)x \\ y1=(1)/(2)(1) \\ y1=(1)/(2) \\ y2=(1)/(2)(2) \\ y2=1 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/m4bulmzutjchhabuzlbnejxtj3ovr5v31c.png)
Two points that are on this line are (1,1/2) and (2,1).
The three lines, graphed, should look like this: