How do you solve the following system?: #x +7y = 3 , 12x + 3y = -2#

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Answer 1 · 2018-07-09T07:02:58

Multiply the first equation by 12

#12x+84y=36#

We have #12x# in both equations so subtract the second equation from the first

#12x+84y=36#
#12x+3y= -2#

#81y=38#

#y=38/81#

Substitute this into equation two

#12x+3xx38/81= -2#

#12x+38/27= -2#

#12x= -92/27#

#x= -23/81#