size 400,400
xrange -10,10
yrange -10,10
axis
axisnumbering
precision 1
grid 2,2,grey,2,2,5,grey
precision 100
snaptofunction y^2-9,y
#snaptofunction y^2-9,abs(y)
linewidth 3
crosshairsize 6
userdraw crosshairs,red
linewidth 2
curve blue,sqrt(x+9)
curve blue,-1*sqrt(x+9)
yunit = y-value
display y,blue,22
