Question 30324
Solve for the column vector v=[x] in the following matrix equation given that :
[y] (Please note that the v has a curved arrow above it) 
A=[2 1]
[1 -3] 
Av=[4]
[-5] (please note that the v has a curved arrow 
HOPE YOU MEAN (A)*(V)=(AV) AND GIVEN (A) AND (AV) YOU WANT TO KNOW (V)..ASSUMING THAT WE HAVE 
{{{matrix(2,2,2,1,1,-3)}}}*{{{matrix(2,1,x,y)}}}={{{matrix(2,1,4,-5)}}}
SO WE GET 
2X+Y=4...........I
X-3Y=-5............II
EQN.1- 2*EQN.II GIVES
2X+Y-2X+6Y=4+10=14
7Y = 14...Y = 2
X=-5+3Y=-5+3*2=1...HENCE 
V={{{matrix(2,1,1,2)}}}