# 7x + y = -2 ……………….. (i) #
# -7x de normale weergavesnelheid + y = -9 …………………… (ii) #
Voeg (i) en (ii) toe
#implies 2y = -11 #
#implies y = -11 / 2 #
Leggen # Y = -11/2 # in #(ik)#
#implies 7x-11/2 = -2 # vermenigvuldig beide kanten met #2#
# Implies14x-11 = -4 #
#implies 14x = 7 #
#implies x = 1/2 #
