exam Maths Puzzle Numerical Ability

two vertices of an octagon lie at (2, -2) and (11,10).
find the perimeter of the octagon.

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exam Other Question

Could you please help me with these equations?

Graph the function
F(x)= -5x-1

Find the slope and the y-intecept
5-1/4y=9x Solve by the elimination method.

9x-9y=36

7y-3x= -14
What is the solution of the system?
Can someone explain this to me? I do not understand this at all...not of it.