If z = x + iy, then what is the value of |z - 1|?

[cheffy]

If z = x + iy, then what is |z - 1| ? Is the 1 just subtracted from the x? How would I graph it?

Thanks!

 

[pka]

Could it be:
\(\displaystyle \L\sqrt {\left( {x - 1} \right)^2 + y^2 } ?\)