how to plot multiple graphs in one plot?

I want a plotting script that will plot multiple graphs on the same plot where the values of my data have the same x coordinate. This will show the differences of each variable in the plot. I tried to plot using spreadsheet, but the plots are not clearly identifiable each other. My data looks like: x y1 y2 y3 y4 1 10 25 28 30 2 20 15 40 20 3 10 10 30 20 4 2 5 15 30 . . . .