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A: (2 , -3)
B: (-3 , 2)
X1 = 2; Y1 = -3; X2 = -3; Y2 = 2
Uso la siguiente ecuacion para hallar la recta.
Y - Y1 = m(X - X1)
Donde: m = (Y2 - Y1)/(X2 - X1)
m = (2 - (-3))/(-3 - 2)
m = (2 + 3)/(-5)
m = 5/-5
m = -1
Ahora reemplazo el valor de m en Y - Y1 = m(X - X1)
Y - (-3) = (-1)(X - 2)
Y + 3 = -X + 2
Y = -X + 2 - 3
Y = -X - 1 (Ecuacion de la recta)
a = -1
b = -1
Te anexo la grafica