Answer :
For a line parallel to x-axis and at a distance of 3unit above x-axis, the values of x and y would be as follows-
'x' = 0
'y' = 3.
equations satisfying this would be =>
2x + y = 3;
x = 2y - 6;
x+y = 3. etc
The linear equation of a line parallel to X axis and is at a distance of 3 units above X-axis is y = 3