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.

n = m-a

Step-by-step explanation:

The formula is :  ...(1)

a is actual cost of an item

m is original price

n is amount of coupon

We need to solve the formula for the amount of coupen.

Subtracting m to the both sides of equation (1).

a-m = m-n-m

-n=a-m

or

n = m-a

So, the formula for the amount of coupon is n = m-a.

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