Algebra 2 Absolute Value, Piece-wise and Linear Programming: Spencer is an artist getting ready for a gallery opening. He paints both watercolors and pastels. Each type of picture takes him about the same amount of time to paint. He figures he has time to paint at most 16 pictures. The materials for each watercolor will cost him $15 and the materials for each pastel will cost him $5. He has $180 to spend on materials. Spencer makes $100 profit on each watercolor and $40 profit on each pastel. How many of each type should Spencer paint to achieve maximum profit?