what is the slope of a line that is parallel to the x-axis? m=
what is the slop of a line that is perpendicular to the x-axis? m=
what is the slop of a line that is parallel to the y-axis? m=
what is the slop of a line that is perpendicular to the y-axis? m=
Parallel to the x-axis and perpendicular to the y-axis: zero Parallel to the y-axis and perpendicular to the x-axis: undefined I hope that's right, that's how I remember it
