4x-y= 11 dan 3y + 2x = -5 x = a dan y = b. berapakah nilai 2a - b?

Jawaban terlampir di gambar yaa

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

(4x-y=11)x3 -> 12x-3y=33

2x+3y=-5
12x-3y=33
--------------- +
14x=28
X=2

2x+3y=-5
28+3y=-5
3y=-33
Y=-11

2a-b
(2x2) - (-11)
4+11
15