book Maths Puzzle Numerical Ability

find 3 consecutive integers such that the sum of the first two integers is nine more than the third integer.

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book Other Question

2x+3y-z=7
5x+4y+2y=-3
-3x-2y-3z=8

Need to figure out what x, y, and z are and I'm totally lost.
Describe the locus of the points.

Points that are equadistant from the vertices of the polygon.