gaokao 2015 Q2

gaokao · China · sichuan-arts Vectors Introduction & 2D Perpendicularity or Parallel Condition
2. Vector ${ } ^ { \mathbf { 1 } } = ( 2,4 )$ is collinear with vector ${ } ^ { \mathbf { 1 } } = ( x , 6 )$. Then the real number $x =$
(A) 2
(B) 3
(C) 4
(D) 6
2. Vector ${ } ^ { \mathbf { 1 } } = ( 2,4 )$ is collinear with vector ${ } ^ { \mathbf { 1 } } = ( x , 6 )$. Then the real number $x =$\\
(A) 2\\
(B) 3\\
(C) 4\\
(D) 6