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X1 = -1; Y1 = -2; X2 = 4; Y2 = 1
Podemos usar la siguiente formula para hallar la ecuacion de la recta.
Y - Y1 = m(X - X1)
Donde: m = [Y2 - Y1]/[X2 - X1]
m = [1 - (-2)]/[4 - (-1)]
m = [1 + 2]/[4 + 1]: m = 3/5
Ya tengo m = 3/5; X1 = -1; Y1 = -2
Y - Y1 = m(X - X1)
Y - (-2) = (3/5)(X - (-1))
Y + 2 = (3/5)(X + 1)
Y + 2 = 3X/5 + 3/5
Y = 3X/5 + 3/5 - 2
2 = 10/5
3/5 - 2 = 3/5 - 10/5 = -7/5
Y = 3X/5 - 7/5 (Ecuacion de la recta)
Te anexo la grafica.