Question

a/b=7/3then find the value of the following rations
1) 7a+9b/7a-9b​

Answer 1

Step-by-step explanation:

7*7+9*3/7*7-9*3

=49+27/49-27

=76/22

=3.45

Answer 2

Answer:

Given that,

a/b = 7/3

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

7a/9b = 49/27 ...(i)

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! (: