A=p-prt for r . would you show me how to solve this equation step by step?

A=p-prt for r

1 Answer
May 15, 2018

r = \frac{p-A}{pt}

Explanation:

The idea here is to isolate the prt onto one side of the equation and then solve for r:
Add prt to both sides:
A+ prt = p - prt + prt
A + prt = p subtract A from both sides
A-A + prt = p-A
prt = p-A Now that prt is isolated, you can solve for r

Divide both sides by pt (restriction pt \ne 0 )
\frac{prt}{pt} = \frac{p-A}{pt}
r = \frac{p-A}{pt}