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

My question says to solve the equation and check the solution.
square root of x=15

Could you help me with this? thanks!
express in terms i and simplify: sqrt -45

show work please