Everything students need to master function basics in Algebra 1 — from the definition and vertical line test to identifying increasing, decreasing, and constant intervals. Fully digital, self-grading, and no prep required. ★ WHAT'S COVERED (4 Topics) • Defining Functions — the "exactly one output" rule, function notation f(x), the vertical line test, identifying functions from ordered pairs and tables; visual canvas diagrams showing function vs. non-function • Domain & Range — inputs (domain) an