exam Maths Puzzle Numerical Ability

can someone please help me with this problem:

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
simplify:

(4x^3+x^2-3)-(-9x^3+5x^2-5)


thank you for your help The number of straight lines (n) that can connect (p) points is given by the eqaution n= p(p-1)
-------- How many points has a figure if only 15 lines can be