Question 1069458
The first is m=0, since the y-coordinate is unchanged, and the line runs parallel to, and 1 unit below the x-axis.
The second is m=undefined, since the x-coordinate is unchanged, and the vertical line runs parallel to and 3 units to the right of the y-axis.
{{{graph(300,300,-10,10,-10,10,y=-1)}}}
The other line is vertical on the line x=3.