Álgebra: Variável, Incógnita e Equações

Section role: supports the 'Traduzindo Desenhos em Álgebra' section while the teacher formalizes the standard mathematical symbolism connecting the grocery challenge to formal algebra. Slides: (1) Title — 'Da Caixa Surpresa à Álgebra'; (2) Variável vs Incógnita — bullets: definition of variable as changing value (e.g., price per kg), definition of unknown as fixed target value (e.g., final answer to find), mask metaphor; (3) Everyday Examples — bullets: electricity bill based on hours, taxi fare; (4) The Balance Scale — bullets: the equal sign as a balanced scale, keeping both sides equal (ax + b = c); (5) Step-by-Step Sequences — bullets: recursive step definition with +2 examples; (6) Closing slide — 'Qual é a diferença entre a letra que muda e a letra que esconde um segredo?' — hands control back to the teacher to verify understanding before the detective activity.

Lara da Teachy