exam Maths Puzzle Numerical Ability

I really need help on this problem: If f is a linear function and f(0)= 10 and
f(10)= 14, find f(5) and f(-5).
PLEASE HELP ME!!!!!!!!

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exam Other Question

-3/x-1/>9

the / are absolute value signs and > is supossed to be greater than or equal to.
The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 52 in., find the width of the rectangle.

I worked this problem and I came up with 9 in. Hope I am right!!