exam Maths Puzzle Numerical Ability

I did try the problem but in the back of the book it has a completely different answer than what i got.

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exam Other Question

Suppose that the monthly total cost for the manufacture of alarm clocks is {{{c(x)=25x+3503}}} and the total revenue is {{{R(x)=83x}}}, where x is the number of alarm clocksproduc Could you please solve this system by the addition method, indicating if the system is independent, inconsistent, or dependent.
I really appreciate your help. Thank you very much.

-3x + y = 3
2x - 3y = 5