Question

4x + 3y =21 ,3x + 4y =21 than x + y=?​

Answer 1

Answer:

as both the sums of 4x+3y and 3x+4y are equal,

4x+3y=3x+4y

4x-3x=4y-3y

x=y

so, as x=y,

3x+4y=21

3x+4x=21

7x=21

x=21/7

x=3

as x=y both their values are 3

x+y= 3+3= 6

Step-by-step explanation: