Which statement about the lines below is true?

4y = −16 and 3x = 27

select all that apply.
a. line 4y = −16 is horizontal.
b. line 3x = 27 is vertical.
c. for both lines, all points on the line have an x- and a y-coordinate.
d. for either line, one of the coordinates of all the points is always the same value.