Question

The formula a = m − n represents the actual cost, a, of an item with original price m after a coupon for n dollars off is applied. Solve the formula for the amount of the coupon. Group of answer choices n=a+m n=m−a n = a − m n = −m − a

Answer 1

Answer: Option B.

Explanation:

The given formula is

`a=m-n`

where,

a = actual cost of an item.

m = Original price

n = Amount of coupon

We need to solve the formula for the amount of the coupon (n).

In means, we need to isolate n in the given formula.

We have,

`a=m-n`

Subtract m form both sides.

`a-m=m-n-m`

`a-m=-n`

Multiply both sides by -1.

`-(a-m)=n`

`-(a)-(-m)=n`

`-a+m=n`

So,
`n=m-a`.

Therefore, the correct option is B.