exam Maths Puzzle Numerical Ability

Graph an Equation of the form Ax + By = C
3x + y = 3

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exam Other Question

-5+6k=-15 Need help please
Okay
need the degree and equation:

n 1 2 3 4 5
f(n)11 21 35 53 75

i think the degree is 4 and it is linear
but that is as far as I can get
Help Please

Thanks
llo