How do you solve the following system?: #7x +4y = 13 , -7x - 2y = -2#

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Answer 1 · 2018-04-30T08:02:03

By arranging the equations. Get #x=-9/7# and #y=11/2#

Add these:

#7x + 4y = 13#
#-7x - 2y = -2#

#7x - 7x + 4y - 2y = 13-2#

#2y = 11#

#y=11/2#

Put this value in the first equation:

#7x + (4times11/2) = 13#

#7x + 22 = 13#

#7x = 13-22#

#7x = -9#

#x = -9/7#