Question

Considere a reta r que passa pelos pontos (0, 2) e (-2, 4). Sua equação geral é?

Answer 1

          A reta na sua forma reduzida
                   y = ax + b
                         a = coeficiente angular (pendente)
                                  a = (y2 - y1)/(x2 - x1)
                         b = coeficiente linear (ordenada na origem)
        Em
             P1(0, 2)
             P2(- 2, 4)
                                   a = (4 - 2)/(- 2 - 0)
                                      = 2/-2
                                      a = - 1
      Em P1(0, 2)
                             2 = - 1(0) + b
                                      b = 2
                                                       EQUAÇÃO
                                                              reduzida:
                                                                      y = - x + 2
                                                              geral
                                                                      - x - y + 2 = 0