You are given a matrix A which is an 3x3 matrix with integer elements.
det(A) = 2.
Your friend tells you the solutions to Av=(4 -8 16)
is v=(2 1 4) [these are vectors, so flip them vertically].
How do you know he/she is lying ?
hint: use Cramers Rule

Question

You are given a matrix A which is an 3x3 matrix with integer elements. 
det(A) = 2. 
Your friend tells you the solutions to Av=(4 -8 16)
is v=(2 1 4) [these are vectors, so flip them vertically].
How do you know he/she is lying ?
hint: use Cramers Rule

shubhamsrg · Answer

well i just simply trust my friend..after all,,a friend in need is a friend indeed!! :P

shubhamsrg · Answer

otherwise i dont know! :D