input: Write a function to create a data visualization dashboard in Python using Matplotlib. The function should generate data, create a figure, configure the plot, and display it.
  import matplotlib
  import matplotlib.pyplot as plt
  
  assert create_dashboard()==None
  assert create_dashboard(x=[1,2,3,4,5], y=[10,25,30,50,80]).canvas.get_width_height() == (640, 480)
output: def create_dashboard(x=None, y=None):
      if x is None:
          x = [1, 2, 3, 4, 5]
      if y is None:
          y = [10, 25, 30, 50, 80]
      
      fig, ax = plt.subplots()
      ax.plot(x, y)
      ax.set_xlabel('X-axis')
      ax.set_ylabel('Y-axis')
      ax.set_title('Data Visualization Dashboard')
      plt.show()