book Maths Puzzle Numerical Ability

A bond issued by Zephyrs Balloons currently has a market price equal to $1080. The bond pays $120 interest annually.
A) If you buy the bond and its price does not change during t

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book Other Question
It says:

Find the equation of a line passing through the pair of points. Write the equation in the slope-intercept form.

The problem:

(7/6,1) and (-1/3,0)

I'm totally l I need help solving this problem: T(x)=Ax, find vector x whose image under T is b. Is x unique?
A=
1 -2 1
3 -4 5
0 1 1
-3 5 -4
b=
1
9
3
-6