if 3x-5y=1 , 2x/x-y=4 then find the value x+y.
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2x-5y=1.................1
from equation 1
2x=1+5y
by putting the value of x from equation 3 in equation 2
2x=4(x-y)
2x=4x-4y
4y=4x-2x
4y=2x
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