# 2x + 3y = -5 …………….. (i) #
# -2x-12y = 4 ……………. (ii) #
Přidat # (i) # a # (ii) #
#implies 2x-2x + 3y-12y = -5 + 4 #
#implies -9y = -1 #
# impliesy = 1/9 #
Dát # y = 1/9 # v # (i) #
#implies 2x + 3 * 1/9 = -5 #
#implies 2x + 1/3 = -5 #
#implies 6x + 1 = -15 #
#implies 6x = -16 #
#implies x = -8 / 3 #
