book Maths Puzzle Numerical Ability

How do you solve:

5x+3y-2z=112
7x+5y=70
3x+y=9z+96

and

3w+3x+6y+5z=10
4w+5x+8y+2z=15
3w+6x+7y+4z=30
4w+x+6y+3z=25

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book Other Question

(x^3-1)/(x-1)

thank you for your time tickets to a high scholl play cost $1.10 for each adult and 40 cents for each child. if 360 tickets are sold for a total of $282.60 how many tickets of each kind are sold?