Question

13x + y =27 at 7x+13y=15 then x -y is ​

Answer 1

Solve simultaneously

13x + y =27..................1st

7x + 13y =15.................2nd

*y =27 - 13x..................3rd

Subt 2 into 3

7x + 13(27-13x) =15

7x + 351 - 169x =15

351 - 162x =15

-162x = -336

-x = -2.07

*x = 56/27

•7(56/27) +13y = 15

392/27 + 13y = 15

13y = 13/27

*y = 1/27 or y = 0,04