How do you solve using gaussian elimination or gauss-jordan elimination, #3x-4y=18#, #8x+5y=1#?

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Answer 1 · 2018-01-18T14:48:50

#x=2# and #y=-3#

From first equation, #y=(3x-18)/4#

After plugging value of #y# into second equation,

#8x+5*(3x-18)/4=1#

#(32x+15x-90)/4=1#

#(47x-90)/4=1#

#47x-90=4#

#47x=94#, so #x=2#

Thus, #y=(3*2-18)/4=-3#