A line that is parallel to the y-axis has a constant x-coordinate for all points on the line. Therefore, the equation of a line parallel to the y-axis is in the form x = a, where "a" is a constant value.
A line that is parallel to the y-axis has a constant x-value for all points on the line. Therefore, the equation representing a line that is parallel to the y-axis can be written as x = constant. The value of the constant can be any real number. For example, x = 2, x = -5, or x = 0 are all equations of lines that are parallel to the y-axis.
