The six is in the hundreds place. Since no number is specified for the tens, a 0 goes there as a placeholder. The two, since it has no tag, is assumed to go in the ones. Another six goes in the tenths place after the decimal.
If I were you, I would make the starting point (3,-6). From there, you will want to use the slope of -1/2 (go down 1 unit and to the right 2 units and draw a point)