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Xr= X1+rX2 / 1+r
yr= y1+ry2/ 1+r
donde X1=7, X2= 2, y1= 4, y2= 1,sustituimos en formulas:
Xr = [7+(-2)(2)] / 1+(-2)= 7-4 / -1= -3
yr= [ 4+(-2)(1)] / 1+(-2)= 4-2/ -1= -2
El punto buscado es Pr (-3, -2)