book Maths Puzzle Numerical Ability

x + y = -4

4x + y = -13

y + 3z = -10

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With the major options package and destination charge, a sports car cost $24,416. The base price of the car was ten times the price of thr major options package and fifty times the destination charge. What was the base price of the car? 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