Question

3x+4y=12 and 4x+3y=9 then x+y =

Answer 1

Step-by-step explanation:

hope this answer will be helpful

Answer 2

Answer:x=0

y=3

Step-by-step explanation:  3x + 4y = 12         eq. 1

                                              4x + 3y = 9           eq.2

adding eq. 1 and 2

we get,

3x + 4y = 12

4x + 3y = 9

7x + 7y = 21

x+ y = 3         eq. 3

subtracting eq. 1 and 2

we get,

3x+4y=12

4x+3y=9

-x+y=3          eq.4

adding eq. 3 and 4

x+y=3

-x+y=3

2y=6

y=3

putting y=3 in eq.3

x+3=3

x=0