How do you solve the system of equations #9x=-2y+129# and #y=-x+12#?

1 Answer
Ho Kae Boon
Jul 22, 2017

#x=15, y=-3#

Explanation:

#9x=-2y+129#--------#(1)#
#y=-x+12#-------------#(2)#

Substitude#(2)# into #(1)#
#rArr##9x=-2(-x+12)+129#
#rArr##9x=2x-24+129#
#rArr##7x=105#
#rArr##x=105/7#
#rArr##x=15#

Substitude#x=15#into#(2)#
#rArr##y=-15+12#
#rArr##y=-3#

#:. x=15, y=-3#

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