Question

If 3 + 4 = 7, 4 + 3 = 9, Find the value of (x-y).​

Answer 1

Given:

Consider the equations are

`3x+4y=7`

`4x+3y=9`

To find:

The value of x-y.

Solution:

We have,

`3x+4y=7` ...(i)

`4x+3y=9` ...(ii)

Subtracting (i) from (ii), we get

`4x+3y-(3x+4y)=9-7`

`4x+3y-3x-4y=2`

`(4x-3x)+(3y-4y)=2`

`x-y=2`

Therefore, the value of x-y is 2.