book Maths Puzzle Numerical Ability

Determine whether the relation is a function.

X |-5|0|2|6|
__________________
Y | 0|1|2|3|


A) Function

B) Not a function

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Please help solve this problem thanks-

Solve each system by the addition method

Nickels and Dimes. Winborne has 35 coins cinsisting of dimes and nickels. If the value of his coins is $3.30, then how many of each type does he have?
the conjugate of
sqare_root(2)-square_root(3) is:
square_root(2)+square_root(3).

But can it be:
-sqare_root(2)-square_root(3)?