Question

(3x-4y= 8) -(x+y=5). find the value of x and y.​

Answer 1

Answer:

( x , y ) = ( 4 , 1 )

Step-by-step explanation:

The given equations are :

3x - 4y = 8 (1)

x + y = 5  (2)

Multiplying equation 2 by 4 we get ,

4x + 4y = 20 (3)

Adding equations 1 and 3 we get ,

3x - 4y = 8

4x + 4y = 20

Cancelling -4y and +4y and adding 3x and 4x we get ,

7x = 28

Therefore,

x = 28/7

x = 4

Substituting x = 4 in equation 2 we get ,

x + y = 5 (2)

4 + y = 5

y = 5 - 4

y = 1

The solution to the given simultaneous equations is (4 , 1 )

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