Question

4 x + 3 y = 23 and 3 x + 4 y = 5 then the value of x + y ​

Answer 1

Step-by-step explanation:

4x +3y = 23 _(1)

3x+ 4y = 5 __ (2)

multiple by 3 on equation 1 and multiple by 4 on equation 2 and subtract 1 form 2

12x +9y-12x -16y = 69-20

-7y =49

y= -7

put y in equation 1

4x + 3 (-7) = 23

4x -21 =23

4x =23+21

4x = 44

x= 11

then x+ y = 11-7

x+y = 4