No 18 yaaaaa................

x - 3y = 12
x = 12 + 3y

2x + 5y = 2
2(12 + 3y) + 5y = 2
24 + 6y + 5y = 2
11y = 2 - 24
11y = -22
y = -2

x = 12 + 3y
x = 12 + 3(-2)
x = 12 - 6
x = 6
HP = (6,-2)

2a - b = 2(6) - (-2) = 12 + 2 = 14 (D)