Question

$if 15x + 17y = 31and17x + 15y = 21. find \: the \: value \: (x - y)$
find the value of (X - Y)​

Answer 1

Answer:

(15x +17y=31)-(17x+15y=21)=(-2x+2y=-10)

2x-2y=10

take 2 as common

x-y=5