Hva er [(-3x-8y = 20), (- 5x + y = 19)]?

Hva er [(-3x-8y = 20), (- 5x + y = 19)]?
Anonim

Svar:

# x = -4 #

# Y = -1 #

Forklaring:

# -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 #

Erstatning # x = -4 # i ligning (2)

# -5 (-4) + y = 19 #

# 20 + y = 19 #

# Y = 19-20 #

# Y = -1 #