Question

If 3x + 5y = 9 and 5x + 3y = 7, then find the value of x + y.​

Answer 1

Step-by-step explanation:

3x+5y + 5x+3y = 9+7

8x+8y=16

8(x+y) =16

x+y=16÷8=2

Answer 2

Answer:

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

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

multiplying eq(1) by 5 & eq(2) by 3 we get

15x+25y=45

-15x ± 9y= - 21

_____________

16y=24

y=

16

24

=

2

3

[y=

2

3

] and x=

3

9−5x

2

3

=

2

−1

Hence[x=

2

1

]& [y=

2

3

]

so x+y=

2

1

+

2

3

=2