What is #[(-3x-8y=20),(-5x+y=19)]#?

1 Answer
Nallasivam V
Jul 8, 2018

#x=-4#
#y=-1#

Explanation:

#-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#

Substitute #x=-4# in equation (2)

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

#y=19-20#

#y=-1#

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