Sequences and series are traditionally thought of as topics for the pre-calculus or calculus class, when learners are figuring out how to develop limits. But this unit uses patterns and slopes of linear functions in unique ways to bring series and sequences into the algebra 1 classroom. Learners develop recursive and closed form equations, predict future values, and link graphs on the coordinate plane to series values. A great activity set for gently introducing number theory into the geometry classroom.