Which way do the x-axis and the y- axis go in horizontal bar graph?

On a bar graph you have the X-Axis and the Y-Axis, the Y-Axis is a vertical line (straight line facing up )and the X-Axis is the horizontal line (straight line facing down) if you want to remember where the Y-Axis is then you say north to south and you draw that and if you want to remember where the X-Axis is then you just sat east to west or you say, Yay Xmas (Christmas)