Answer:
x = 0
Step-by-step explanation:
An undefined rate of change ( slope ) indicates that the line is vertical and parallel to the y- axis, with equation
x = c
where c is the value of the x- coordinates the line goes through.
The line goes through (0, - 4 ) with x- coordinate 0 , thus
x = 0 ← equation of line, which is in fact the y- axis
