If a line is
- if a line is perpendicular to another line
- if a line is parallel to y axis
- if a line is parallel to the x axis what is the slope
- if a line is straight what is the slope
- if a line is vertical then its slope is
- if a line is tangent to a circle then it is
- if a line is parallel to x axis
- if a line is drawn parallel
- if a line is horizontal its slope is
- if a line is vertical its slope is
