exam Maths Puzzle Numerical Ability

2x-2y=15
4x+4y=10

Help, I need to solve for x and y

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exam Other Question

Write the equation of the parabola in standard form given the following properties:

Focus: (-5/2,0)
Directrix: x= -4

Thank you in advance
if X and Y are nonzero integers, which of the following must be an integer?

X+(Y/X)

(X+Y^2)/X

(X^2+XY)/X

(X^2+Y^2)/X