book Maths Puzzle Numerical Ability

A pay phone is holding a maximum number of 500 coins consisting of nickels, dimes and quarters. The number of quartes is twice the number of dimes.
If the value of all the coines is $88.00, how many nickles were in the pay phone?

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book Other Question

The figure shows the graph of y = (x – 3)(x – 5)(x – a). Determine the
value of a.
This question is on elimination...and it is also my last question... i just wanted you to check my answers to make sure that they were right.
-1/3x-4/3y=-2
1/3x-2/3y=4

My answer was (4,-4) Is this right?
thank you so so much!~