Question

{2x - y = 23}
{x+ 3y = 22}

Answer 1

2x - y = 23

x + 3y = 22

x = 22 - 3.3

x = 22 - 9

x = 13

x = 22 - 3y

2. (22 - 3y) - y = 23

44 - 6y - y = 23

-7y = 23 - 44

-7y = -21 . (-1)

7y = 21

y = 21 / 7

y = 3