Write an equation of the vertical line through the point (3,0)
Here the point lie on x−axis and equation of x−axis is y=0
where SLope is Zero m=0
The slope of vertical line means perpendicular line to x−axis is m1×0=−1
m1=∞
The equation of line from (3,0) and slope m1=∞
y=10(x−3)
0=x−3
x=3