Today, everything at a store is on sale. The store offers a 20% discount. a) The regular price of a T-shirt is $18. What is the discount price?

b) If the regular price of an item is dollars, what is the discount price in dollars? Write an expression.

c) The discount price of a hat is $18. What is the regular price?

a. $14.4

b. $18 • .2 = $3.6

c. $21.6

Step-by-step explanation:

a. Make the 20% a decimal, and multiply by the regular price. Then, subtract that and you'll get the discounted price.

18 • .2 = 3.6

18-3.6 = $14.4

b. Use the equation multiplying the 20% as a fraction here.

c. Multiply $18 by .2 (the discount). Then, add that to the discount price ($18).

18 • .2 = 3.6

3.6 + 18 = $21.6

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation: