Question

if a/b= 3/5 then find 7a+9b/7a-9b​

Answer 1

Answer:

38/11

Step-by-step explanation:

GIVEN THAT

ab=7/3

Now multiplying the numerator by 7 and denominator by 9,we get

7a/9b=49/27.....

Now we use the formula

a/b=c/d

or (a+b)/(a-b)=(c+d)/(c-d)

from (i) we get

(7a+9b)/(7a-9b)=(49+27)/(49-27)

or (7a+9b)/(7a-9b)=76/22

or (7a+9b)/(7a-9b)=38/11

Hope it helps...

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