Engineering

stress on a beam, current in a circuit

Stress on a beam = (Force × Length) / (cross-section). Plug your numbers in — that is algebra solving for you.

Economics

supply-demand equations

Supply-demand intersection finds equilibrium price. Solving algebraic systems is daily work for analysts.

Medicine

drug dosage by body weight

Programming

variables in every line of code

Every line of code uses variables — `x = 5; y = x + 3` is algebra. Software is just algebra at scale.

Cooking

scaling recipes by people count

Recipe says "100g per person, 4 people". For 10 people: x = 100 × 10 = 1000g. Algebraic scaling.

Physics

every formula is algebra