Odgovor:
#(-26,-45)#
Pojasnilo:
# 4x = 3y + 31 #-------(1)
# y = 2x + 7 #----------(2)
Postavite (2) v (1), # 4x = 3 (2x + 7) + 31 #
# 4x = 6x + 21 + 31 #
# 4x = 6x + 52 #
# 2x = -52 #
# x = -26 #
v enačbo (2)
# y = 2 (-26) + 7 #
# y = -52 + 7 #
# y = -52 + 7 #
# y = -45 #
