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primero encontramos la pendiente( m)
m=y2-y1.....m=1-5 .....m= -4 ..........m=2
x2-x1 -1-1 -2
ahora utilizamos el modelo punto.pendiente.
y-y1=m(x-x1)
y-5=2(x-1)
y-5=2x-2
y=2x-2+5
y=2x+3
la ecuacion de la recta es y=2x+3