exam Maths Puzzle Numerical Ability

Is this a function?

x + y = 12

a. yes
b. no
c. It depends
d. None of the above

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exam Other Question

What is the solution of the system?
x+5y=6
x=8-5y felix has 35 coins consisting of dimes and nickles. If the value of his coins is $3.30, then how many of each type does he have?