Question

x+y=27 x-y=3 x+3y=2 x+y=4
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Answer 1

x+y=27

x+y-27=27-27

x+y-27=0

x-y=3

x-y-3=3-3

x-y-3=0

x+3y=2

x+3y-2=2-2

x+3y-2=0

x+y=4

x+y-4=4-4

x+y-4=0