tolong di jwb pertanyaan ini

3x + y = -2
-2x + 3y = 5

• 3x + y = -2
y = -2 - 3x
y = -3x - 2

• -2x + 3y = 5
-2x + 3 ( -3x - 2 ) = 5
-2x - 9x - 6 = 5
-11x = 5 + 6
-11x = 11
x = -1

• y = -3x - 2
y = -3 (-1) - 2
y = 3 - 2
y = 1

x - y
= -1 - 1
= -2 ( a )