Question

determine as equacoes das retas que passam pelos pontos descritos a seguir: b) P(4,-1) e Q(1,3)

Answer 1

achando o coeficiente angular
m = 3 - (-1) / 1 - 4
m = 4 / 3
pegando o ponto Q
y - yQ = m,(x - xQ)
y - 3 = 4/3. (x - 1)
y - 3 = 4x/3 - 4/3
y = 4x/3 - 4/3 + 3
y = 4x/3 + 5/3
f(x) = 4x/3 + 5/3