Answer:
[tex]\frac{I}{Pt}[/tex]= r
Step-by-step explanation:
First write down the equation they gave you:
l = Prt
You need to ask yourself what is being done to r. r in this case is being multiplied by two variable: P and t. To undo multiplication you divide, the set up for division:
[tex]\frac{I}{Pt} = \frac{Prt}{Pt}[/tex]
I divided by the two numbers, so it would be easier. The P and T cancels out on the right and you are left with r. On the left, however, it stays the same because there are no like terms to solve with. You just leave [tex]\frac{I}{Pt}[/tex] as it is.
The result you get is:
[tex]\frac{I}{Pt}=r[/tex]
