Straight line graphs are important tools that are used in many fields. They can be used to model growth trends over time in areas like body size, house prices, and market share. Filters can be applied in Photoshop and Fireworks to transform images. Straight line graphs are critical for determining correct dosages in medicine and predicting trends in economics, biology, chemistry, the stock market, and government budgets. They are essential for analyzing health factors like body mass index and for the veterinary treatment of animals.