book Maths Puzzle Numerical Ability

A circle with radius 10 and center (h,6) passes through the points (8,-2). Find the possible values of h.
a. 2 or 8
b. 2 or -6
c. -6 or 14
d. 2 or 14

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book Other Question

You have a triangle with sides 6, 7 and x. What is the maximum that x can be and why? Is (2,3) the solution to the linear system defined by

y=3x-3
2x+4y=16