title: Multiple line subplots in R
body: <p>I am new to R and am struggling to understand how to create a matrix line plot (or plot with line subplots) given a data set with let's say one x and 5 y-columns such that:
  -the first subplot is a plot of variables 1 and 2 (function of x)
  -the second subplot variables 1 and 3 and so on
  The idea is to use one of the variables (in this example  number 1) as a reference and pair it with the rest so that they can be easily compared.</p>
  
  <p>Thank you very much for your help.</p>