Válasz:
# X = -4 #
# Y = -1 #
Magyarázat:
# -3x-8Y = 20 # ----------- (1)
# -5x + y = 19 # -------------(2)#xx # 8
# -3x-8Y = 20 # ---------------(1)
# -40x + 8Y = 152 # -------------(3) ---#(1) + (3)#
# -43x = 172 #
# X = 172 / (- 43) = - 4 #
# X = -4 #
Helyettes
# -5 (-4) + y = 19 #
# 20 + y = 19 #
# Y = 19-20 #
# Y = -1 #