Posted by lina on Sunday, August 30, 2009 at 10:45pm.
The concept i get, but somehow i just can't execute this problem, please help me!
You are given vectors A = 5.5 6.2 and B =  3.7 7.4 . A third vector C lies in the xyplane. Vector C is perpendicular to vector A and the scalar product of C with B is 19.0.
I need x and y components for vector C

physics [vectors]  Damon, Monday, August 31, 2009 at 6:09am
A = 5.5 i + 6.2 j
B = 3.7i + 7.4 j
C = x i + y j
A dot C = A C cos theta
if perpendicular theta is 90 degrees and cos theta = 0
so
5.5 x + 6.2 y = 0
B dot C = 19
so
3.7 x + 7.4 y = 19.0
solve those two equations for x and y 
physics [vectors]  DN, Tuesday, November 17, 2015 at 12:28pm
5.5(_3.7x+7.4y=19)
3.7(5.5X+2.2y=0)
(20.35x+22.94y=0)
+ (_20.35x+40.70y=384.65)
Y=384.68/63.64
X=_(22.94(384.68/63.64)/20.35)