I can't draw this one, as ur  guide make it sure that the cirlce raduis is perpndicular to the line x +2y=3  that touches to one of the tip of the circle..
 to draw a line, please make a table for x and y intercept by assuming any real number, then plot those points then  align , probably that will be the  tangent line of a circle...
thanks but what i need is the equation of the circle