How do I write an equation in slope intercept form for a line that is parallel to the y-axis and has has an x-intercept of 3

x=3

Step-by-step explanation:

Keep in mind that the equation of the y-axis is simply x=0. A line parallel to the y-axis that passes thru x = 3 has the equation x=3. That's it.

You cannot write this in slope intercept form because vertical lines don't have defined slopes.