Solve the System of Equations Using the Addition Method: 3a $a = 6 , b = - 15$

Multiple Choice

Solve the system of equations using the addition method: 3a + b = 3
A + 2b = 11

A) $a = 6 , b = - 15$
B) $a = 2 \frac { 2 } { 3 } , b = - 5$
C) $a = - 1 , b = 6$
D) $a = 1 , b = 0$