Question #310fa

1 Answer
Wataru
Nov 23, 2014

#{a+b}/{a-b}=3/8#

by multiplying by #8(a-b)#,

#=>8(a+b)=3(a-b)#

by distributing #8# and #3#,

#=>8a+8b=3a-3b#

by subtracting #8b# and #3a#,

#=>5a=-11b#

by dividing by #5#,

#=>a=-11/5b#

Hence, by plugging in #a=-11/5b#, we have

#{3a}/{4b}={3(-11/5b)}/{4b}=-33/20#

I hope that this was helpful.

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