exam Maths Puzzle Numerical Ability

How can you put an equation in standard form when they give you a problem and another set of points?
ex: (2,13) 5x-3y=-16[I am not sure if that is a good example(sorry)]

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exam Other Question

P=44 units,x+6 (side) x+6 (bottom)

This is my Square Equation

Any help would be greatly appreciated:)
Solve using the square root property:
2x^2 – 35 = 15