exam Maths Puzzle Numerical Ability

I am needing help one last time.

Identify the vertices and foci of the graph of the hyperbola

x^2/16 - y^2/16 = 1

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exam Other Question

Solve the system of equations: (hint: let (1/x)=t and (1/y)=u)

(2/x)+(1/y)=11
(3/x)-(5/y)=10
i have two coordinates in the x axis being(1 and 4) and in the y axis (3 and 2) how do i find the distance between two cordinates?