exam Maths Puzzle Numerical Ability

2x-5y+z=5
3x+3y-z=17
4x-3y+2z=17

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exam Other Question

OP = <6,5>, OQ = <13, −2>, u = i − 3j and v = 3i − 2j. If PQ = ku + hv
where k and h are constant, find
a)k and h Hint: PQ = PO + OQ).
k & h already get answer k=1 & h=2....
b)Unit vector for PQ in terms of i and j?? Solve by graphing.Indicate wheter system is independent,inconsisent ,or dependent: 2x-3y=12
3y-2x=-12