current carrying wires

1. The problem statement, all variables and given/known data

A very long, straight wire carries a current of 0.75 A. This wire is tangent to a single-turn, circular wire loop that also carries a current. The directions of the currents are such that the net magnetic field at the center of the loop is zero. Both wires are insulated and have diameters that can be neglected. How much current is there in the loop?

2. Relevant equations

http://www.webassign.net/cutnell7e/a...21/math069.gif
http://www.webassign.net/cutnell7e/a...21/math083.gif

3. The attempt at a solution

all i have is a picture drawn of a straight wire with a circular wire loop next to it. i know the formulas but i can't figure out how to put them together
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
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 never mind. i figured it out. it was easier then i was trying to make it. :)