How do you solve the following system?: #7x +y =-2 , -7x +y = -9#

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Answer 1 · 2016-01-22T21:35:00

#7x+y=-2....................(i)#
#-7x+y=-9........................(ii)#

Add (i) and (ii)

#implies 2y=-11#

#implies y=-11/2#

Put #y=-11/2# in #(i)#

#implies 7x-11/2=-2# multiply both sides by #2#

#implies14x-11=-4#

#implies 14x=7#

#implies x=1/2#