Question

3x-4y=10 ; 4x-3y=5 solve this by substitution method

Answer 1

Heya !!!

3X - 4Y = 10 ------(1)

4X - 3Y = 5 --------(2)



From equation (1) we get,


3X- 4Y = 10


3X = ( 10 + 4Y )


X = ( 10 + 4Y/3) ----(3)


Putting the value of X I equation (2)


4X - 3Y = 5


4 × ( 10 + 4Y/3) - 3Y = 5


40 + 16Y/3 - 3Y = 5



16Y - 9Y + 40 = 15


7Y = 15 - 40

Y = -25/7


Putting the value of Y in equation (3)


X = ( 10 + 4Y/3)


X = 10 + 4 × -25/7
*****--------------------
************3



X = 10 - 100 /7
*****--------------
**********3


X = 70 - 100/7
*****--------------
*********3


X = -30/7/3 = -30/7 × 1/3


X = -10/7


Hence,


X = -10/7 and Y = -25/7


★ HOPE IT WILL HELP YOU ★

Answer 2

15 is the answer I think correct