Question

If 3x + 5y = 9 and 5x + 3y = 7 then What is the value of x+y?​

Answer 1

Answer:

2

Step-by-step explanation:

3x + 5y = 9 ...(1)

5x + 3y = 7 ...(2)

Adding both,

3x + 5y = 9

5x + 3y = 7

8x + 8y = 16

=> 8x + 8y = 16

=> 8(x + y) = 16

=> x + y = 16/8 = 2

Answer 2

Answer:

$\huge \fbox {x + y = 2}$

Equation 1

3x + 5y = 9

Equation 2

5x + 3y = 7

$\mid \: addition \mid$

$3x + 5y = 9$

$5x + 3x = 7$

$8x + 8y = 16$

$8x + 8y = 16$

$8 \: (x + y) \: = 16$

$x + y = \frac{16}{8}$

$x + y = 2$