beth-rogers_60ae0508f24a3
beth-rogers_60ae0508f24a3
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Tebeos de María (x) son igual a los tebeos de Sara (y) - 4 : x = y - 4 Tebeos de María - 2 equivalen al triple de tebeos de que tendrá Sara (y): 3(x-2) = y+2 Sustituyendo 1 en 2: 3(y - 4 - 2) = y+2 3y - 18 = y+2 Despejando: 3y-y = 20 2y …