Plotting graphs - putting subjects against eachother

[jules]

Hi,

I have two sets of information - IQ, and KS2 results for Science, English
and Maths.
Im trying to find if there is a relationship between whether IQ affects KS2
results.

Ideally, i'd like a graph with IQ on the y-axis and then 3 lines on the
graph showing the different subjects.

I cant seem to be able to make a graph where i can either add one line at a
time, or where i can define what i want on the y-axis.

Thanks