Question

X=75 Is it Slope Intercept Form,Point Slope Form,or Standard Form?

Answer 1

Standard form
It is used to find vertical lines of a graph. Slope intercept form is
$y = mx + b$
and point slope form is
$y - y _{1} = m(x - x_{1})$

Answer 2

x = 75 is a special case of the equation of a straight line

the equation x = c , is a vertical line parallel to the y- axis and passing through all points in the plane with an x- coordinate equal to c

It is not usually described using any of the usual descriptions, namely

slope-intercept, point-slope or standard form