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

solve by addition
4x-y=3, 5x+4y=2
a)1,__)
b)-10/21,23/21
c)(__,2)
d) no solution
please help me with this problem.

Solve the equation.

21n^2 + 63n = 0