Jada and lin are comparing inches and feet. Jada says that the constant of proportionality is 12. Lin says it is 1/2.

Jada and lin are comparing inches and feet.

Let I denote inches and F denote feet.

It is given that

I = k F or F=m I

So, I/F=k or m=F/I

As we know 1 feet = 12 inches

constant of proportionality i. e k=1/12

In case 2, constant of proportionality=12/1=12

So, Jada must have calculated ratio of feet to inches while Lin has calculated the ratio of inches to feet.