book Maths Puzzle Numerical Ability

In which of the following is y a function of x

a. 3y+2x-9=0
b. x+y^2=5
c. x^2+y^2=25
d. noone of these

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book Other Question

The distance from the center of a compact disc to the edge of the disc is 6 centimeters. What is the area of the compact disc?
a) 36 square centimeters
b) 18.84 square centimeter
"A purse contains 22 coins, some of wich are dimes and the rest, quarters, Altogether, the coins are worth more than $3.40. At least how many of the coins are quarters? At most how many are dimes?
Please help me!"