Given
If a horizontal line passes through (3,9), what is the equation of the line
Solution
A horizontal line has a slope(m) of 0 . We can use the point-slope form for a linear equation since we know the slope and the point (3,9)
If a vertical line passes through the point (3,9), what is the equation of the line?
A vertical line is where x is constant. Since it has to pass through the point (3,9) , the equation must be: