Vertical lines are the only lines that can't be expressed in the form `y=mx+b.` However, the equations of vertical (and horizontal) lines are very simple. Since this line goes through `(-7,4)` and is vertical, it also goes through `(-7,0),(-7,-12),(-7,23.221),` and in fact `(-7,y)` for every value of `y.` The only thing distinguishing these points is the fact that in all of them `x=-7.`
The equation is `x=-7.`
let write equation in point slope form
where point is `(x_1,y_1)` and slope is m.
Required line is vertical line i.e. parallel to y axis.let us write point slope equation as
slope of y is `oo` ,so above equation reduces to
Thus equation of vertical line posses through (-7,4) is