>>347
 class Point
  attr :x, :y
  def initialize(x, y)
  @x, @y = x, y
  end
 
  def updown?(a, b)
  (@y > a * @x + b) ? "#t" : "#f"
  end
 end
 
 a, b = 1, 5
 p = Point.new(1, 5)
 puts p.updown?(a, b)