exam Maths Puzzle Numerical Ability

HELP Please!!

The function that relates the Cost ($) of an oil well to its Depth (x) in feet is as follows:
C(x) = -146,983 + 58.72 * x
Find and interpret C(3500).

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exam Other Question

I need to know how to create a set of linear equations which go through the point (1,2). I can get a ghetto answer by graphing the point and creating some lines, but I want to know how to do the problem right.
thanks in need of help with solving this system: {x^2-100y^2=100
{x^2+ y^2=100
thanks for the help.