title: How to use values in list from one function in a second function
body: <p>I am working on coding a precalculous problem.  I was able to write one function and get an (x,y) plot in a python list.  I want to be able to call list[0] and list[1] of the first function in a second function. How do I setup my functions so that I can use the outputs from the first function as inputs in the second functions?</p>
  <pre><code>import numpy as np
  import sympy as sy
  
  # find the point of intersection of two points by using a linear function
  
  def intersection(slope1, yintercept1, slope2, yintercept2):
      xval = -1*slope1+slope2
      recip = np.reciprocal(xval)
      xval = yintercept1*recip
      yval = slope2*xval
      point = [xval, yval]
      return point
  print(intersection((sy.Rational(-6,7)), 9, sy.Rational(7,6), 0))
  
  #find the distance two points are apart.
  
  def distance(x, y):
  
  #I want to call the point from my intersection function here and put them into the distance formula 
  to find out how far away the point is from the origin.  
   
  print(distance(0,0))
  </code></pre>