Risposta:
# (4y + 2) / (3-y) a (D) #
Spiegazione:
# Y = (3x-2) / (4 + x) #
# "moltiplicare entrambi i lati per" 4 + x #
#rArry (4 + x) = 3x-2 #
# rArr4y + xy = 3x-2larrcolor (blu) "distribuzione lato sinistro" #
# rArrxy-3x = -2-4ylarrcolor (blu) "raccoglie termini in x a sinistra" #
#rArrx (y-3) = - (2 + 4y) larrcolor (blu) "factor out x" #
#rArrx = - (2 + 4y) / (y-3) larrcolor (blu) "divide per" (y-3) #
#rArrx = - (2 + 4y) / - (3-y) larrcolor (blu) "factor out - 1" #
# RArrx = (4y + 2) / (y-3) a (D) #