Data in Rectangular Arrays

Algebra 2 · Axiom Academy

TechStop tracks three products across three locations — see how one rectangular array replaces nine separate numbers. You manage TechStop 's inventory across three stores and three products — one matrix replaces nine separate numbers with a single organized structure. Every store is a row, every product is a column — entry (i,j) means row i , column j . Adjust any store's stock and watch the matrix, and each product's company-wide total, update live. A truck arrives with new stock for every store. Updating nine numbers by hand invites mistakes — matrix addition does it in one step, adding each entry to the matching entry in the same position. TechStop is growing. Drag the store count and compare tracking every number by hand against writing one matrix equation that updates all of them at once. One matrix, three moves: read it by row and column, combine it with matrix addition, and it keeps paying off as you scale it up. The same rectangular-array idea drives graphics engines, organizes datasets, and powers neural-network math — anywhere numbers naturally have both a row and a column.

This is the written version of the interactive lesson above. See the full Algebra 2 course.