Question

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

A=p-prt for r

Answer 1

`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}`