Question

BOOKS Akira bought one new book for \(20 and three used books for \)4.95 each. Write and evaluate an expression to find how much money the books cost.

Short answer

The expression is $\left(x+3y\right)$and total cost of the books is $34.85.

Step-by-step solution

Step 1. Defining the variable.

Let $x be the cost of 1 new book.

And $y be the cost of 1 old book.

Thus, 1 new book and 3 used books cost $$\left(x+3y\right)$

Step 2. Example of finding total cost.

If $5 be the cost of one book, then the total cost of 10 books will be

$\$(5\times 10)=\$50$

Step 3. Finding the total cost.

The cost of one new book bought by Akira is $20

And the cost of one used book by Akira is $4.95

Thus, the cost of all books is given by,

$\begin{array}{l}\left(x+3y\right)=\$20+3\times \left(\$4.95\right)\\ =\$34.85\end{array}$