This 9+10 page Essentials worksheet and answer key focuses relations and functions.- Mapping a relation, domain, range- Determining if a relation is a function, input, output- Vertical line test- Generating a table of valuesEssentials worksheets give students review, guided, and independent practice in preparation for assessment, remediation post-assessment, and as a supplemental resource for RTI - response to intervention. The worksheets can be used in the classroom or as homework and study pre