exam Maths Puzzle Numerical Ability

Please help me solve this equation: f(x,y)= 4+ x-2y over 2
y

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3) The formula for calculating the amount of money returned for deposit money into a bank account or CD (Certificate of Deposit) is given by the following: A = P (1 + r/n) When solving systems of relations, how do you know which conic section you will have by looking at the equation. For example: x^2-y^2=9, x+y=5