Question

1 способов підстановки x – y = 2, 3х - 2y = 9​

Answer 1

$\displaystyle \left \{ {{x-y=2} \atop {3x-2y=9}} \right. \\\\\left \{ {{x=2+y} \atop {3x-2y=9}} \right.\\ \\3(2+y)-2y=9\\y=3\\x=2+3\\x=5\\(x,y)=(5,3)$

Answer 2

x – y = 2, 3х - 2y = 9
x=5 y=3