Question

if a
$\frac{x}{y}$
then find the value of
$\frac{3x + 7y}{3x - 7y}$

​

Answer 1

Answer:

Given

2x−y3=9...(1)3x+y7=2...(2)

Let us use the elimination method to solve the given system of equation.

Multiply (1) by 3 and (2) by 2,We get

6x−y9=27...(3)6x+y14=4...(4)

Now, subtracting equation (3) from(4)

(6x+y14)−(6x−y9)=4−27

⇒y14+y9=−23

⇒y23=−23

⇒y=−1

Substitute the value of y in equation (1), we have

2x−(−1)3=9

⇒2x+3=9

⇒2x=6

⇒x=3

Hence  x=3,y=−1