Question 1095511
(x,y), x for amount of drink and y for cost


(20, 1.2) and (32, 1.6) points


{{{m=(1.6-1.2)/(32-20)=0.4/12=4/120=2/60=1/30}}}


In point-slope form, {{{y-1.2=(1/30)(x-20)}}}-----do what you need from this.