book Maths Puzzle Numerical Ability

Dear Math Tutor,
I need help with this problem. I also need this problem by April 23, 2006.

(a-b)raised to the 2 power -3(a-b)-18=0, find the value of a-b-14 if a-b+3=0

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book Other Question

x + y = -4

4x + y = -13

y + 3z = -10
I am having trouble with this problem, I have come up with a couple different answers. Thank You for your help and time.

Solve: 3x^2 - 2xy + 1