exam Maths Puzzle Numerical Ability

Will someone please help me word this the right way? Thank you all so very much.
Systems of equations can be solved by graphing or by using substitution or elimination. What are

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(x+3)(x-3)+(x+7))(x-3)=0 -8x - 5y = -45 as a function of x.

Options:

A)f(x)=8x + 9

B)f(x) = -8/5 + 9

c)f(x) = 5/8x - 45

d)f(x) = -8x + 45