Question

4. Find the value of x - y, if 3x - 4y=9 and 4x - 3y = 12​

Answer 1

Step-by-step explanation:

value of y is 0 hai aur value x ki 3 hai dono eq. ko solve karna hai

Answer 2

Answer:

3

Step-by-step explanation:

3x - 4y = 9 ....1)

4x - 3y = 12 ....2)

To cancel x from these two equations, we will multiply them by the L.C.M. of 3 and 4 (which is 12) and then subtract them.

3x - 4y = 9

= 12x - 16y = 36

4x - 3y = 12

= 12x - 9y = 36

Equation 1) - 2)

12x - 4y - 12x + 9y = 36 - 36

5y = 0

y = 0

Now, by substituting the value of y in any of the equation, we get that,

x = 3

So, x - y = 3