exam Maths Puzzle Numerical Ability

I have tried and tried to figure this one out, very important homework, any help is appreciated.

Friedman and Rosenman (1974) have classified people into two categories: Type:

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exam Other Question
Here T defined by .Find a vector “x” whose image under T is b, and determines whether x is unique.
A=1 -3 2
0 1 -4
3 -5 -9
b= 6
-7
-9 how do you use line segments