exam Maths Puzzle Numerical Ability

Why does y=3 represent a function, but x=3 does not?

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exam Other Question

This expression has gotten me down.

Directions are: Write the expression in terms of logarithms of x and y:

log 5^x2/y ( the y is under a square root symbol)

Thanks f
Multiply:
((x^2+x-12)/(x^2-x-20))X((x^2+2x-35)/(x^2+9x+14))