The price should be $36.75
Thickest to thinnest....
0.33m , 0.3mm, 0.275mm, 0.25mm
This would be point-slope form.
Slope-intercept form is in the form: y = mx + b
Standard is in the form ax + by = c
Point-slope form is in the form y - y.1 =m(x - x.1)
The form this most closely resembles is point-slope.