code: func (l Line) Formula() (m, b float64) {
  	// Account for horizontal lines
  	if l.B.Y == l.A.Y {
  		return 0, l.A.Y
  	}
  
  	m = (l.B.Y - l.A.Y) / (l.B.X - l.A.X)
  	b = l.A.Y - (m * l.A.X)
  
  	return m, b
  }
docs: // Formula will return the values that represent the line in the formula: y = mx + b
  // This function will return math.Inf+, math.Inf- for a vertical line.