book Maths Puzzle Numerical Ability

A cash box contained $12.25 in quarters, dimes, and nickels. If there were five more than twice as many dimes as nickels and one less than three times as many quarters as nickels, how many of each kind of coin was there?

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book Other Question

Please help me solve this equation and show me how it was done so that I will be able to finish the rest of my homework.
-10b - 7 = 9
Can you please explain to me how you create an equation (function) from looking at a parabola? I can make a parabola from an equation. But not the other way around. I need very easy and explained steps!
Thanks for your time and effort.
-C.