I have to graph data like this:

mass

o2
2

boron
4

iron
5

zinc
8


MASS

red
12

blue
13

green
14

yellow
15



as a line chart with 2 lines. I can get the lines to be on the graph but
don't know how to get the labels so it makes sense. Anybody able to walk me
thru (I'm stupid) a good way to do this?