input: Write a python function to plot a graph using matplotlib with given x and y values, title, and labels.
  assert plot_graph([1,2,3], [4,5,6], 'Test Graph', 'X Axis', 'Y Axis') == None
  assert plot_graph([10,20,30], [40,50,60], 'Example Graph', 'X Label', 'Y Label') == None
output: def plot_graph(x, y, title, xlabel, ylabel):
      import matplotlib.pyplot as plt
      
      plt.plot(x, y)
      plt.title(title)
      plt.xlabel(xlabel)
      plt.ylabel(ylabel)
      plt.show()