exam Maths Puzzle Numerical Ability

I need help please does anyone know how to do this?

516,548,566,534,586,529,546,523,538,523,551,552,486,558,574

Ascending pattern: 486,516,523,523,529,534,538,546,548,551,552

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exam Other Question
Find the x- and y- intercepts of 7x-2y=-5 and use them to graph the equation.

Please provide me with as many steps as possible. I am trying really hard to understand how to do these. Thank you.

r^2-r-6/3r-9