book Maths Puzzle Numerical Ability

Find the point of the intersection of the following system of equations algebraically

x^2-Y=5
and 2X+y=3

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book Other Question

A public safety department for a local community employs 23 officers of which 5 are sergeants. Due to the size of the community, 3 of the officers on duty at any given time must b 3x + 3y - 6z?